Answer:
The removal of impurities is usually done chemically. For example, in the manufacturing of iron, calcium carbonate is added to the blast furnace to remove silicon dioxide from the iron ore. Zone refining is an economically important method for the purification of semiconductors.
Explanation:
with such a rich diverse array of life forms how are we able to live harmoniously with each other
Explanation:
Life on earth is incredibly diverse. Biological diversity is the variety of life on earth. This includes all the different plants, animals, and microorganisms. Life on earth is incredibly diverse. Biological diversity is the variety of life on earth. This includes all the different plants, animals, and microorganisms; the genes they contain; and the ecosystems they form on land and in water. Biological diversity is constantly changing. The source of this diversity is evolution, the process of gradual change during which new species arise from older species. Evolutionary biologists study the evolution of living things in everything from the microscopic world to ecosystems. There are so much duversity in life on the Earth because there are great numbers of species on the earth, the present day organism are the end product of about 3.5 billion years of organic evolution on earth.
the nucleus of the sieve tube of the plant phloem is lost
Answer:
The sieve tubes of the phloem in angiosperms consist of sieve tube elements or members. These are cells which lose their nucleus, ribosomes, and vacuoles at maturity. They of course have cytoplasm, and it is connected by channels to companion cells (which do have these organelles).
Explanation:
this is the correct answer
If a true-breeding tall pea plant is crossed with a true-breeding dwarf pea plant and all of the offspring are tall plants, the trait tall plant is:
Answer:
It is dominant over "dwarf plant."
Explanation:
If a true-breeding tall pea plant is crossed with a true-breeding dwarf pea plant and all of the offspring are tall plants, the trait tall plant is it is dominant over "dwarf plant."
What is dominant traits?Dominant traits are always explained when the related allele has dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.
The frequency of expression of dominant and recessive traits can be Dominant traits = always / Recessive = sometimes.
According to the question if there is self cross TT×tt then there is TT, Tt, Tt and tt, which means there is a 75% possibility of dominant trait and 25% recessive.
A dominant trait has an inherited trait or characteristic that appears in an offspring and covers the effects of another allele and/or prevails or exhibit its trait above another.
Therefore, If a true-breeding tall pea plant is crossed with a true-breeding dwarf pea plant and all of the offspring are tall plants, the trait tall plant is it is dominant over "dwarf plant."
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When more than two species are interacting, and evolutionary change in one causes change in one or more of the others, it is known as:
Answer:
coevolution, the process of reciprocal evolutionary change that occurs between pairs of species or among groups of species as they interact with one another. The activity of each species that participates in the interaction applies selection pressure on the others.
Explanation:
Hope I could help.
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True or False: Transcription and Translation can occur at the same time for a single mRNA in prokaryotes.
Answer:
False, they cannot
which of the following is a function of the cell membrace?
Explanation:
Tell me the option in comments section and i will answer you （⌒▽⌒）（⌒▽⌒）Answer:
Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell while keeping other substances out.
Explanation:
Damage to the capillaries throughout the body can directly cause which problem?
A
Inability of the body to absorb nutrients from food
B
Inability of the body to send oxygen to tissues
C
Inability of the body to release food energy
D
Inability of the body to receive information from the legs
.
Answer:
B. Inability of the body to send oxygen to tussues
What are the three general classes of neurons that correspond to the three major aspects of nervous system function
Those who argue that biology and genetics have the strongest influence on development emphasize ________.
Those who argue that biology and genetics have the strongest influence on development emphasize nature.
What are the influence of the nature in the development?The natures refers the hereditary factors or genes of the child.It helps in building a child's personality traits.It also defines the child's physical appearance.The biology influence development by the gene. One gene cane interact with other gene and environment in which some dominantThe biologically determined characteristics (nature) includes certain genetic diseases ,eye color, hair color, and skin color. The other things are also includes like life expectancy and height but it is also depends upon environment and lifestyle of individual.
The biological factors which includes genetic influences , brain chemistry, hormone levels, nutrition and gender.
The five different forces the influenced human evolution like nature selection, random genetics drifts, mutation, population mating structure and culture.
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Imagine looking through a microscope at a squashed carrot root tip. The chromosomes of many of the cells are plainly visible. In some cells, replicated chromosomes are aligned along the center of the cell. These particular cells are in which stage of mitosis
the endocrine system is responsible for communication in the body using
Answer:
using your hormones as a chemical message to your brain
Explanation:
Two products are the result of photosynthesis. What is the waste product produced and released by the plant?
Question 11 options:
glucose
oxygen
carbon dioxide
water
Answer:
oxygen
Explanation:
anyone help me? 1 number 2
Answer:
i dunno what class is this of, so tell me in the comment and I may rectify my answer according to that.
btw here u go
Explanation:
in q 1, part a, we need to tell what we observed in the growth of plants. we observed that the plant h was groing faster and healthier that plant g due to the fact that it was provided with a nutritive solution.
in its part b, we write the conclusion, i.e the plant which was provided with a nutritive solution grew more as all minerals required by the plants were replenished properly.
In q2, part a, we just compare their physical properties such as the plant g was not as healthy as plant h and plant h grew faster and taller than plant g.
in q2, part b, we just write what the solution is supplying the plant with, you can also check each one of their speciality on the web and write it also.
hope it helps
;)
to improve cardiorespiratory endurance the frequency of the workout sessions should be
Answer:
cardiorespiratory endurance?In summary, to improve cardiovascular fitness, a regular aerobic exercise program, repeated 3–5 times per week for 20–60 minutes and at an intensity of 142–186 BPM
Explanation:
Which type of cell is shown in the figure?
A: Triploid cell
B: Diploid cell
C: Polyploid cell
D: Haploid cell
Answer:
Haploid
Explanation:
During a biology lab you are asked to look at an animal and
a bacterial cell under a microscope and document what
components they both share in common. Which of the
following is NOT a feature that all cells have in common?
1.Dna
2.cell membrane
3.cell wall
4.cytoplasm
Answer:
2. Cell wall
Explanation:
animals and some other organisms don't have cell walls, unlike plants (which has cellulose cell walls), bacteria (which has murein or peptidoglycan cell walls), etc.
Arolium uses in a cockroach.pleasehelpme.
Answer:
just run away ........ ok save yourself
When a nerve impulse reaches the end of an axon of a neuromuscular junction, calcium flows ______ the synaptic knob.
Answer: flows INTO the synaptic knob.
When a nerve impulse reaches the end of an axon of a neuromuscular junction, calcium flows into the synaptic knob.
In a neuromuscular junction, there are three parts. They are the presynaptic terminal or synaptic knob, the synaptic cleft and the postsynaptic terminal. The calcium ions will work in the synaptic knob when the nerve impulse arrives.
Once that the nerve impulse reaches the end of the axon, it will affect the presynaptic terminal. In there, it causes the opening of voltage-gated calcium channels. As a result:
Calcium flows into the presynaptic terminal.The calcium makes the vesicles (with neurotransmitters) descend and fuse with the terminal membrane to release the neurotransmitters to the synaptic cleft.In conclusion, the nerve impulse causes the opening of voltage-gated calcium channels, and calcium flows into the synaptic knob.
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Which of the following is not a function of the human skeletal system?
a. Fatty acid storage
b. Primary glycogen storage
c. Protection of organs
d. Calcium storage
PLS HELP ME QUICK, Name and Title:
Include your name, instructor's name, date, and name of lab.
Objective(s):
In your own words, what was the purpose of the lab?
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
Complete your hypothesis (above).
Identify the independent (test) variable and the dependent (outcome) variable: __________________________
Practice using the computer model. Select each marker to see what it does. Here is a summary you can refer back to as you complete your experiment.
Carbon Dioxide Emissions Slider: You will use the arrows to change the amounts of carbon emissions.
Time Step Size: This will allow you to view the data every 5 years or every 10 years.
Start Over: Use this to reset the model if needed.
The current carbon emissions are 9.8 gigatons, or 9.8 billion tons. Complete all three scenarios to find out what happens to the global temperature if these emissions stay the same, decrease, or increase over the next century. Follow the instructions in the Data section of this report.
Data:
For each scenario, record the carbon dioxide emission rate and the global temperature. The data for the years 1960–2010 are already filled out for you.
Scenario One: Carbon dioxide emissions stay the same
Set the carbon dioxide emissions rate to 9.8 gigatons.
Set the time step size to 10 years.
Select step forward until you have the data through the year 2110.
Record the data in the table below.
Year Carbon Emissions (gigatons) Temperature (Fahrenheit)
1960 4.2 57.2
1970 5.8 57
1980 6.2 57.4
1990 7.8 57.6
2000 8 58
2010 9.8 58
Maintain carbon dioxide emissions at 9.8 for the rest of scenario one.
2020
2030
2040
2050
2060
2070
2080
2090
2100
2110
Scenario Two: Carbon dioxide emissions decrease
Set the carbon dioxide emissions rate to 9.8 gigatons.
Set the time step size to 10 years.
Select the step forward button once.
Decrease the carbon dioxide emissions by 0.2 and press step forward.
Continue stepping forward once, decreasing the carbon emissions each time, until you reach 2110.
Record the data in the table below.
Year Carbon Emissions (gigatons) Temperature (Fahrenheit)
1960 4.2 57.2
1970 5.8 57
1980 6.2 57.4
1990 7.8 57.6
2000 8 58
2010 9.8 58
Decrease carbon dioxide emissions by 0.2 each step forward for the rest of scenario two.
2020
2030
2040
2050
2060
2070
2080
2090
2100
2110
Scenario Three: Carbon dioxide emissions increase
Set the carbon dioxide emissions rate to 9.8 gigatons.
Set the time step size to 10 years.
Select the step forward button once.
Increase the carbon dioxide emissions by 0.2 and press step forward.
Continue stepping forward once, increasing the carbon emissions each time, until you reach 2110.
Record the data in the table below.
Year Carbon Emissions (gigatons) Temperature (Fahrenheit)
1960 4.2 57.2
1970 5.8 57
1980 6.2 57.4
1990 7.8 57.6
2000 8 58
2010 9.8 58
Increase carbon dioxide emissions by 0.2 for each step forward for the rest of scenario three.
2020
2030
2040
2050
2060
2070
2080
2090
2100
2110
Conclusion:
Use your data to answer the following questions. Use complete sentences, and be as detailed as possible.
Summarize how the carbon emissions affected the atmospheric temperature in each of the three scenarios:
Scenario One:
Scenario Two:
Scenario Three:
Was your hypothesis supported by your results or not? Explain how you know.
Explain the difference between the greenhouse effect and global warming.
Based on your knowledge of how the greenhouse effect works, why does the level of carbon dioxide affect the global temperature?
Name three sources of atmospheric carbon dioxide.
PLS HELP ME AM IN A HURRY
Answer:
Scenario One:
Scenario Two:
Scenario Three:
Was your hypothesis supported by your results or not? Explain how you know.
Explanation:
Fill out the data table below with the range of each factor that will produce the optimal number of oxygen bubbles.
The optimal ranges for the formation of oxygen bubbles vary between each plant, however, only water, c02, and temperature are limiting factors for photosynthesis.
This question is based on observations made during the course of an experiment designed to measure the optimal ranges at which oxygen bubbles form, given that these are an indication of photosynthesis.
Due to this, the information given will be generalized. Firstly, there is no exact optimal range of light for the formation of oxygen bubbles (photosynthesis) given that this is not a limiting factor.
Excess of light will have no effect on photosynthesis, only the lack of light can cause negative effects, therefore any light past the minimum threshold is fine.
On the other hand, water, light, and C02 are in fact limiting factors and have optimal ranges. For water, this optimal range varies greatly and therefore I cannot offer a general value, but an excess of water will "drown" plants by not allowing the formation of air pockets in the soil.
C02 sits at an optimal range of 1,000-1,300ppm for the best results. Lower concentrations cause a lower rate of photosynthesis given that it is the primary substrate for the process to begin. At too high levels, plants will have to adapt which can slow the process.
Finally, temperature is also a limiting factor for photosynthesis. Its exact value cannot be given since it varies greatly between plant species.
However, in general, terms, since it is an enzyme-dependent reaction, we can apply the general temperature at which enzymes function best which is around 37 degrees.
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Why can mutations in one organism function the same way in a different organism?
No only a small percentage of variants cause genetic disorders of the most have no impact on health or development. For example some variants alter a gene DNA sequence.
If the alleles of two different genes are present on the same chromosome, the closer they are to each other the more likely they are to ________________________________ during gamete production.
If two alleles of different genes are in close proximity with each other on the
same chromosome, they would most likely link during gamete production.
Meiosis is the type of cell division that takes place in gamete( sperm and egg cells) production. The alleles are responsible for the phenotype of an
organism.
When alleles are in close contact on the same chromosome they are most
likely to be linked together and transmitted as a single unit . These brings
about variation between parents and daughter cells in some features such
as color, height etc
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food, water, shelter, and warmth represent ________ needs in maslow’s hierarchy of needs.
Food, water, shelter, and warmth represent physiological needs in Maslow’s hierarchy of needs.
Abraham Maslow proposed and developed a theory in human development psychology titled "A theory of human motivation" in 1943.
Maslow's Hierarchy of Needs can be defined as a pyramid model which typically represents the fundamental (basic) needs of an individual, that are essential and required to be met before he or she can achieve complete growth, development and self-actualization.
The five (5) levels of Maslow's Hierarchy of Needs in a chronological order are;
Physiological.Safety.Belonging and love.Social needs or esteem.Self-actualization.According to Abraham Maslow the psychological needs comprises:
I. Food.
II. Water.
III. Shelter.
IV. Warmth.
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Scientists have inserted a gene that codes for resistance to a biodegradable weed killer into a certain plant. Which of the following is the most likely benefit of the gene?
O The plant is more likely to survive when exposed to the weed killer
O The plant will be able to convert the weed killer into fertilizer.
O The plant will be able to produce chemicals to kill weeds around it.
O The plant is more likely to die when exposed to the weed killer.
QUICK PLEASE
Answer:
The plant is more likely to survive when exposed to the weed killer
Explanation:
since it has a gene that is resistant to the weed killer, it wont be affected by it.
resistant means it can defend itself from something
What are the functions of guard cells?
Guard cells control the opening and closing of the stomata in plant cells.
WHAT ARE GUARD CELLS:Guard cells are structures that surrounds the stomata of plant cells and regulates the opening and closing of the stomata. The stomata, which are located on the leaves of plants opens in order for the plant to perform gaseous exchange i.e. intake of CO2 and release of O2.Therefore, Guard cells function to control the opening and closing of the stomata in plant cells.
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how long does it take new species to form on earth?
Research found that a major change to persist and for changes to accumulate took about one million years
Million of years...
tehy where evolving for a couple million years until we have the animals we have now
Which is the BEST statement about joint flexibility? A. It is constant for any joint type. B. It is constant within a family. C. It is consistent between an individual's joints. D. It varies from joint to joint. Please select the best answer from the choices provided. A B C D.
Which is the BEST statement about joint flexibility?
Answer : D
Explanation : It varies from joint to joint.
Hope this helps you!
The amount of flexibility can vary greatly from joint to joint and is affected by various factors such as joint structure, muscle strength and elasticity, age, and physical activity level. Hence option D is correct.
What is joint flexibility?Joint flexibility refers to the range of motion (ROM) of a joint or a group of joints. It is the ability of a joint to move through its full range of motion without causing any pain or discomfort.
Joint flexibility is an important aspect of physical fitness and is essential for performing daily activities and participating in sports and exercise.
Joint flexibility is determined by several factors, including the anatomy of the joint, the length and elasticity of the muscles surrounding the joint, and the presence of any injuries or medical conditions affecting the joint.
Some joints, such as the shoulder joint, are naturally more flexible than others, like the knee joint.
Flexibility can vary between individuals and between different joints in the same individual. For example, someone may have very flexible hip joints but limited flexibility in their shoulder joints.
Similarly, an individual's joint flexibility can also be influenced by age, gender, and activity level.
Hence option D, It varies from joint to joint. is correct.
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How many codons are needed for 3 amino acids?
Answer:
3 codons are needed for 3 amino acids
The element lithium has two common isotopes: Li–6 and Li–7 If the average atomic mass of lithium is 6.94004 u, determine its percent isotopic abundances. Step by step and explain.
First we need to determine the average atomic mass of these isotopes.
The atomic masses of Lithium-6 and Lithium-7 are 6.0151amu and 7.0160amu respectively.
Now that we have that, we need to set up the relative abundance problem.
We can do that using the formula (M1)(x) + (M2)(1-x) = M(E)
Because you asked for details, I'll explain what each variable stands for-
M1 = the mass of one isotope
x = the relative abundance
M2 = the mass of the second isotope
M(E) = the atomic mass of the element from the periodic table
Therefor all we do now is plug in our respective variable.
M1 = 6.0151amu (Lithium-6)
x = unknown relative abundance
M2 = 7.0160amu (Lithium-7)
M(E) = 6.94004amu
Now the formula plugged in will look like this:
6.0151x + 7.0160(1-x) = 6.94004
Now doing some quick math, we can determine that x=0.07589
For the last step we need to find the percent abundance of each element, which is quite simple. We take X and multiply it by 100 to find Lithium-6, so 0.076 x 100 = 7.6%
and since then we use 1 - X, so 1 - 0.076 = 0.924
We take that and also multiply it by 100, so 0.924 x 100 = 92.4%
Conclusion:
The abundance of the Lithium-6 isotope is 7.6%, and the abundance of the Lithium-7 isotope is 92.4%.
Please ask if you have any questions and I hope this was helpful!