1. Single-celled organisms
a. were the first life forms on the planet.
b. became extinct soon after more complex organisms evolved.
c. can't exist on Earth unless they are parts of large groups.
d. All of the above
(WILL MARK BRAINLEST)
Answers
Answer:
A is the correct answer
Explanation:
the existed about 3.8to 4.0 billion years ago
Related Questions
Tomas investigates coloured lights.
(a) Tomas shines red, green and blue light onto a green object.
He draws a diagram to help explain what happens.
-red light
green light
green object
blue light
(1) What colour does the object appear?
[1]
(11) Explain what happens at the surface of the green object.
[2]
Answers
Higher plants have a polar main axis with a definite stem and root ends. This polarity is first established:
Answers
Higher plants have a polar main axis with a definite stem and root ends. This polarity is first established in the embryo of the seed.
What is the embryo of the seed?Generally, The fertilized ovule is an immature plant from which a new plant will grow.
In conclusion, Plant embryos are the starting point for pattern formation.
Read more about Plant
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Hardening or stiffening of the arteries as plaque accumulates at injury sites in the inner linings of the arteries is known as:.
Answers
Answer : Atherosclerosis
The model shows the flow of energy at each trophic level.
Which trophic level contains the most energy, and why?
A Producers; they have the largest number of individuals of all the trophic levels.
A Producers; they have the largest number of individuals of all the trophic levels
B Primary consumers; they have the most variety of plants from which to obtain energy.
C Secondary consumers; they release the least amount of energy into the next trophic level.
D Tertiary consumers; they have the smallest number of individuals that need to collect energy.
Answers
Answer:
The correct answer is A.
Explanation:
Producers are photosynthetic organisms such as plants and algae. They absorb energy from the sun and convert it to food. This group includes the largest number of individuals. Each of the higher trophic levels includes fewer individuals than the level below it, and roughtly 90% of the energy consumed by each level is lost as heat, meaning that the amount of energy at the highest trophic level is only a fraction of the energy found at the producer level.
An increased hematocrit increases blood ___________________ which ______________ resistance to blood flow.
Answers
Answer:
An increased hematocrit increases blood 50% which increases the relative viscosity from 4 to 8 resistance to blood flow.
In which of the following scenarios is land MOST LIKELY to be degraded as a result of the
"tragedy of the commons"?
A gardener hunts and kills a family of gophers that have dug a burrow beneath his rose
bushes.
O A government sells a section of prairie to a private company interested in drilling for oil.
A rancher cuts down several trees on her property to get wood to use to repair a fence.
A national forest suffers from erosion due to the use of all-terrain vehicles.
Answers
Answer:
Likely the government selling off the prairie
Explanation:
Everyone is losing out on the prairie getting sold to a private corporation, hence why this is the tragedy of the commons
The scenario in which the land is most likely to be degraded as a result of the "tragedy of the commons" is a national forest that suffers from erosion due to the use of all-terrain vehicles. Thus, the correct option for this question is D.
What is land degradation?Land degradation may be defined as the process through which the value of the biophysical environment is affected by a combination of human-induced processes acting upon the land. All these influences gradually reduce or lose the biological or economic productivity and complexity of rain.
A national forest that suffers from erosion due to the corresponding utilization of all-terrain vehicles ruptures the soil productivity due to erosion. This finally leads to the degradation of land with respect to the "tragedy of the commons".
Therefore, the correct option for this question is D.
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All adaptations are physical.
true
false
small adaptations allow species to occupy similar niches.
true
false
the bottom layer of the food pyramid is generally the largest.
true
false
Answers
Answer:
1 false
2 False
3 True
Explanation:
Sorry cannot explain three question right now i definetly will tommorow you can count on me
Molecular systematics might examine all of the following types of data except ________.
Answers
Answer: anatomical features
Explanation:
Molecular systematics might examine all of the following types of data except anatomical features.
A hydroxyl is present at the 3’ end of the growing dna strand. What is at the 5’ end?.
Answers
The following applies to the 5' and 3' end of a DNA molecule:
Hydroxyl group is present at the 3’ end of the growing DNAPhosphate group is present at the 5' end of the growing DNA. What is DNA?DNA meaning deoxyribonucleic acid is a biological molecule made up of monomers called nucleotides.
One nucleotide is joined to another by an ester bond, hence, the DNA molecule has both 5' and 3' end.
Therefore, the following applies to the 5' and 3' end of a DNA molecule:
Hydroxyl group is present at the 3’ end of the growing DNAPhosphate group is present at the 5' end of the growing DNA.Learn more about DNA at: https://brainly.com/question/264225
C6H12O6 is an example of -
a. an amino acid
b. a lipid
C. a carbohydrate
d. a nucleic acid
Answers
Answer:
c. carbohydrate
Explanation:
Simple carbohydrates:
These carbohydrates are composed of sugars (such as fructose and glucose) which have simple chemical structures composed of only one sugar (monosaccharides) or two sugars (disaccharides).
The bulk flow of water across membranes is faster than predicted by osmosis alone because water can move through specialized channels called
Answers
An experimental cross where only a single characteristic is considered (for example, flower color) is called ______. Multiple choice question.
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An experimental cross where only a single character is considered (for example, flower color) is called monohybrid.
What is a monohybrid cross?A monohybrid cross is a type of genetic cross where only one phenotypic trait is assessed in the offspring.
This phenotypic trait can be any observable feature of the individual (for example, flower color in plants).
The monohybrid cross is very useful to understand the inheritance pattern of a particular trait.
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The arteries get clogged and the cells to the heart become damaged by not receiving enough oxygen and nutrients. Then the damage to the heart causes heart attacks. This is characterized by what disease?
a) HIV
b) coronary-artery disease
c) diabetes
d) asthma
e) cancer
Answers
b) coronary-artery disease
What connective tissue sheath wraps the axon of a neuron?.
Answers
Answer:
A connective tissue sheath called the epineurium surrounds each nerve. Each bundle of nerve fibers is called a fasciculus and is surrounded by a layer of connective tissue called the perineurium.
Leia is crossing sunflowers that have different genotypes for height. She crosses a tall sunflower plant with a genotype of tt with a short sunflower plant with a genotype of tt. Which ratio shows the probability that the two sunflower plants will produce a sunflower plant with a genotype of tt?.
Answers
25:25 ratio shows the probability that the two sunflower plants will produce a sunflower plant with a genotype of tt.
What do you mean by genotype?The genotype of an organism is its complete set of genetic material. Genotype can also be used to refer to the alleles or variants an individual carries in a particular gene or genetic location.
A genotype is a scoring of the type of variant present at a given location (i.e., a locus) in the genome. It can be represented by symbols. For example, BB, Bb, bb could be used to represent a given variant in a gene.
A genotype is the specific DNA that an organism inherits from its parents. A phenotype represents every possible way that the genotype manifests itself in the organism.
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Define gene manipulation in one or two short sentences
Answers
Answer:
....
Explanation:
What is the order of the meninges from superficial to deep?.
Answers
The order of the meninges from superficial to deep includes the dura mater, arachnoid mater, and pia mater.
What are the meninges?The meninges are specific membranous layers of the nervous system that protect it from damage and infections.
The meninges protects the brain and spinal cord from different agents (both internal and external factors).
The infections in the meninges may be serious health complications and therefore these layers are fundamental to protect us.
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Can anyone name the 24th element on the periodic table?
Answers
Answer:
chromium
Explanation:
it is 24th element,1st element in group 6
name the 24th element on the periodic table is chromium
the image shows flat sedimentary rock layers in the foreground and angled sedimentary rock layers in the background is they were deposited horizontally and then shifted by a geologic event
converts matter into energy to create a star's extraordinary heat and light.
A
nuclear fission
B
nuclear fusion
C
nuclear explosion
D
a supernova
please help
Answers
Answer:
B. Nuclear Fusion
Explanation:
I gotta A in Bio- Trust :)
A cell is in the process of meiosis. It has just completed crossing over
and independent assortment to produce new gametes.
Which of the following correctly describes how the new gamete cells are
different compared to the parent cell?
Choose all that apply
The new gamete cells contain half the amount of genetic material as the parent cell
The new gamete cells contain more genetic material compared to the parent cell
The new gamete cells contain completely different gones compared to the parent cell.
The new gamete colls contain a different genetic combination compared to the parent
call
Answers
Which is a kingdom
A.mammalian
B.Protista
c. prokaryotes
D.Chordata
Answers
Answer:
B. Protista
Explanation:
The Kingdoms in taxonomy are eubacteria, archeabacteria, protista, fungi, plantae, and animalia.
a. Mammalian describes a mammal
c. Prokaryotes are a kind of cell
d. Chordata is a kind of phylum
Describe how a decrease in ocean ph can affect marine organisms.
Answers
Ocean acidification can negatively affect marine life, causing organisms shells and skeletons made from calcium carbonate to dissolve. The more acidic the ocean is, the faster the shells dissolve.
Hope this helps :))
Organisms depend on pH for living in aquatic life, because due to acidification carbonate is lost, which is the main basic ingredient of saltwater.
How ocean pH affects marine organisms?Carbonate, a main basic ingredient of salt water, is lost as a result of ocean acidification. This makes it more challenging for marine organisms to develop shells and skeletons.
Ocean acidification is sometimes called to as "sea osteoporosis" with a great cause. Ocean acidification can dissolve the minerals used by oysters, clams, lobsters, shrimp, coral reefs, and other sea animals to create their shells and skeletons.
Human health is also an issue, when the acidity of the water increases, the mucus on fish gills hardens, limiting the quantity of oxygen that may enter. This is why pH changes regularly result in fish deaths.
Therefore loss of carbonate from the ocean, the pH of the ocean affects the marine organisms.
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5 points
The red, yellow and green colors of bell peppers are controlled by two
gènes. One gene determines if the pigment produced by the plant will be
yellow or red, with red being dominant to yellow. Another gene
determines whether chlorophyll is broken down early in the growing
season. If the chlorophyll breaks down early, it is possible to harvest the
peppers after they have turned colors. The green chlorophyll normally
hides the red or yellow color. The gene for early loss of chlorophyll is
dominant to the gene for end-of-season loss. Predict the phenotypic ratio
for a mid-season harvest from a cross between a true-breeding yellow
pepper plant and a dihybrid pepper plant.
O 1 yellow: 1 red: 1 green
O 1 yellow: 2 green: 1 red
O 1 red: 2 green: 1 yellow
O 1 red: 1 yellow
O 1 red: 1 green
Answers
The phenotypic ratio of the offspring will be 1 red: 1 yellow if a true-breeding yellow pepper plant is crossed with a dihybrid pepper plant.
What is phenotypic ratio?Phenotypic ratio is the ratio of the phenotype of offspring produced from a cross between two parents.
Let the allele for yellow be y and red Y.
Let the allele for early chlorophyll break down be E and late loss be e.
The genotype of the parents are as follows:
true-breeding yellow parent: yyEE dihybrid parent: YyEeThe cross is as follows: yyEE × YyEe
The offspring produced will be:
yyEE, yyEe, YyEe, YyEe
The offspring will be: 2 yellow, 2red peppers
Therefore, the phenotypic ratio is 1 red: 1 yellow.
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What food is made from the same mold as penicillin?.
Answers
Answer:
Stilton cheese
Explanation:
Answer:
What food is made from the same mold as penicillin? - Cheese .
How does the law of conservation of mass apply to earth’s recycling of water, oxygen, carbon, and nitrogen. Give one example
Answers
Answer:
The law of conservation of mass states no matter is created or destroyed. This means that the matter currently on Earth is the only matter that will ever be available to us. However, it also means that this matter will not be destroyed. So, water, oxygen, carbon, and nitrogen are all used by living things in our world and then recycled to be used again.
One example of this is the water cycle. More water is never added or taken from the world, it is just reused. First, water starts in some body of water and then evaporates into the air. Then, the water falls back to Earth as precipitation.
How do marine plants get energy?
Explain in terms of how sunlight, water and carbon dioxide is absorbed for photosynthesis ( mention the location of stomata when compared to how photosynthesis occurs in a plant that grows on land).
Answers
Marine plants are like sea grass, there aquire sunlight from the sun. They are not so deep so they can easily do the process of Photosynthesis.
☆ Process of Photosynthesis in plants,The leaves of a plant play a major role in the process of Photosynthesis.The stomata is located in the leaves of a plant,it helps a plant to absorb sunlight.When a plant takes carbon dioxide from the environment through stomata, and the water absorbed from the roots goes in the chloroplast and and mix with it.By which,the plant absorbs carbon dioxide and water.☆ The stomata is located in the top part of leaf in a plant.
Hope it helpsWhat do the domains bacteria and archaea have in common?.
Answers
Answer:
Cell membranes are found in both bacteria and archaea, and they both feature a hydrophobic part. Both bacteria and archaea have a protective cell wall.
Explanation:
^^
What will happen you happen if you apply jelly on the leaves of a plant how will photosynthesis work
Answers
Answer:
I feel it will no longer be healthy because the jelly applied to the leaves blocked the stomata. As a result, the plant would be deprived of oxygen needed for respiration. It wouldn't be able to carry out photosynthesis since it wouldn't have access to carbon dioxide.
Another Answer could be:
When you apply the jelly to the stomata of the leaves, they become covered, and transpiration ceases. This reduces the escape of water vapour and allows the leaf's moisture to be retained for a longer period of time. However, because the jelly layer prevents all sorts of gaseous exchange, photosynthesis and respiration are also impossible.
Explanation:
Thinking about function, explain why the left ventricle is much more muscular than the right ventricle.
Answers
Answer:
The left ventricle of your heart is larger and thicker than the right ventricle. This is because it has to pump the blood further around the body, and against higher pressure, compared with the right ventricle.
hope it helps.
thanks
Do you think dog legs homologous to human arms and whale fins?
Answers
Answer:
Similarly,
A dog's leg, A bird's wing, and A whale's finare also homologous to the human arm. Such structures are said to have diverged over time, indicating that at one time, they may have had the same function in the common ancestral organism.
Explanation: