Answer: Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived between 6 and 2 million years ago come entirely from Africa. Most scientists currently recognize some 15 to 20 different species of early humans.
Explanation:
Construct a brief argument to refute Cal’s claim in the following scenario.
Cal is a high-school biology student learning about bodily systems. When studying, Cal focuses on the nervous system because he feels it is the most important system in the body.
Answer: The cardiovascular System
Explanation:
The cardiovascular system homes the heart. The heart is a pump that circulates oxygen and blood throught your body essentially keeping you alive. Without the heart your brain would be dead because your brain would not be getting enough oxygen to funtion. So, although the brain and spinal cord are very important the heart is also if not more for it is the only way you live. You can be brain dead and still alive but not heart stopped and alive.
I hope this helps!
Answer: The Cardiovascular System
Explanation: The other person explained well lol
How many energy transformations and/or transfers happen as electricity is being produced?
-Name at least 4
Answer:
Mechanically – By the action of a force.
Electrically – By an electrical current.
By radiation – By Light waves or Sound waves.
By heating – By conduction, convection or radiation.
Explanation:
pls help
Carl Woese introduced the concept of domains in the 20th century. Which characteristic of scientific knowledge does this highlight?
Answer:
It will remain the same over years
Explanation:
This is your answer
What is the wavelength measurement?
A. 2 m
B. 4 m
C..2 m
D. 4 m
Determine how the sugar in the water affects the petal loss.
Write a sentence that states what you found out about the scientific question you just investigated. Provide enough detail so that a friend who did not do the experiment could learn from your description.
Answer: When you add sugar to your plant's water supply, it changes the ability of the plants to absorb water. In some instances this is helpful such as when the plants are dying off, but in other cases this will damage the plants when the plant is already functioning properly.
Explanation:
complete each word on the second screenshot (just fill in the blank basically)
Answer:
.
Explanation:
It has the biggest particles and feels rough when you rub it. It is usually found near rivers
seas.
(1 Point)
O Clay
O Loam
Silt
O
Sand
What happens when a carnivorous plant grows in soil rich in nutrients?
Please don't copy from Goo gle and give a detailed explanation.
Answer:
that carnivorous plants will invest more energy in nutrient uptake from the soil and less energy in prey capture whenever possible.
Section 1: Overview of Lab
What is the purpose of the lab?
Answer:
the purpose of lab are:
1. it is used as storing different chemical and its tool.
2. it is used as experiment place.
Why does the sun rotate around the planets
Answer:
the sun does not rotate around the planets the planets rotate around the sun
So that mean there is no Resoan why the sun rotate around the planets
Hope This Is What You Wanted :)
1) What determines which genes will be an advantage and which ones will be a disadvantage?
2) How does this experiment illustrate Darwin’s theory of Natural Selection?
Help me Please
(Double Points)
Full Response…
In each stage, how do nephrons filter waste from blood? Stage 1: Stage 2:
Answer:
stage 1;- the glomeruls filters your blood
stage 2 ;- the tubule returns needed substances to your blood & removes wastes.
Explanation:
Monarch butterflies have very long tubular tongues. What is the most likely function of this adaptation?
Question 31 options:
to defend the butterfly from predators
to obtain liquid food from flowers
to sense changes in the environment
to dig holes in the soil for shelter
Babies cry when they are hungry or thirsty. When they cry their parents usually respond, go to and pick up the baby, and give him or her food or milk. Over time, the baby learns that a parent will come when he or she cries. This is a type of learned response called
Question 30 options:
conditioning
imprinting
mimicry
survival
(k12)
Answer:
Question 31 - to obtain liquid food from flowers
Question 30- survival
Explanation:
Butterflies need longer tongues to get into longer flowers and obtain the nectar and liquid food from inside.
Survival is the answer because babies need food and water to survive and they learned a way to get the things that they need.
Can somebody please label the parts of the frog?
Answer: As in other higher vertebrates, the frog body may be divided into a head, a short neck, and a trunk (see Vertebrates). The flat head contains the brain, mouth, eyes, ears, and nose. A short, almost rigid neck permits only limited head movement. The stubby trunk forms walls for a single body cavity, the coelom.
Explanation:
Andy and Mario were playing baseball in the summertime. Andy was wearing a black shirt
and complained about it being
excessively hot. What characteristic of how light transfers would cause this problem?
A. reflection
B. refraction
C. absorption
D. diffusion
c.
he's hot because the color of his shirt absorbs a lot of light and warms him.
4. Why are fossils of the animal Archaeopteryx used as evidence that birds and dinosaurs may be related? *
In each answer, "they" is referring to the Archaeopteryx fossils.
A. They were older than dinosaurs, but not as old as birds.
B. They have some characteristics of both birds and dinosaurs.
C. They were not able to survive as well as birds, but better than dinosaurs.
D. They were found near both bird and dinosaur fossils in rock layers.
General topic: An argument for why climate change poses a threat to organisms
I need the answer to this: how are organisms behaviors or structures are being affected by rising temperatures?
ANSWER THE QUISTION IN PICTURE GIVING BRAINLIEST IF CORECT
Answer: It could be B. or C. I would go with B because it mentions the guard cells
Explanation:
Stomata are composed of two guard cells. These cells have walls that are thicker on the inner side than on the outer side. This unequal thickening of the paired guard cells causes the stomata to open when they take up water and close when they lose water.
Answer:
B
Explanation:
Lab: Flower Dissection pls help
The purpose of the lab is to provide experimental knowledge to the students with respect to a specific topic. During flower dissection, the lab assists students in identifying all major and minor parts of the flower using a microscope.
What do you mean by Flower dissection?Flower dissection may be defined as the observation of different flower parts internally by cutting its thin segment and visualizing under them a microscope.
The practical knowledge assists the students in clearing the concept more easily and making things more understandable. The lab offers the students to identify each component of flowers with respect to its functions narrowly.
Therefore, the purpose of the lab with respect to flower dissection is described above.
To learn more about Flower dissection, refer to the link:
https://brainly.com/question/20366481
#SPJ2
can one of yall help me please and thank you
Living things... oh yes.
The answer here would be "has a heart". Every living thing doesn't necessarily have a heart. Trees and plants do not have hearts, yet they are alive. (Some scientists believe that plants have pulses, though. No heart, but a pulse! Odd, isn't it?)
I hope this answers your question.
-Toremi
Answer:
organization
Explanation:
organisation is something you learn, you don’t need it to survive
Help me plsss no links!!!
Signals from _______ and the body's _______ are received by the brain and the spinal cord.
Once signals are processed and _______ by the central nervous system, a response is sent back to the body.
A central nervous system is also responsible for programming _______ and _______.
The central nervous system includes the brain and spinal cord.Signals from senses and the body's organs are received by the brain and the spinal cord.Once signals are processed and interpreted by the central nervous system, a response is sent back to the body.A central nervous system is also responsible for programming reflexes and instincts.
(I think that's good)
Hi again!!! I finished my science course a bit early so allow me to help! I noticed you were trying to fill in your notes for 6.01 nervous system video so here is what I had put down!
Your internal organs and your senses send signals to your brain and spinal cord.
Once signals are processed and interpreted by the central nervous system, a response is sent back to the body
The central nervous system is also responsible for programming instincts and reflexes like twitching when you're tickled or blushing when you get a flattering text.
Hope this helps! Brainly is not needed but appreciated!
After the desired piece of DNA is added to the plasmid, the plasmid is placed into a(n) _____________ for incubation.
Answer:
plasmid vector
Explanation:
What are the steps of mitosis? explain the steps
Today, mitosis is understood to involve five phases, based on the physical state of the chromosomes and spindle. These phases are prophase, prometaphase, metaphase, anaphase, and telophase.
Prophase
Mitosis begins with prophase, during which chromosomes recruit condensin and begin to undergo a condensation process that will continue until metaphase. In most species, cohesin is largely removed from the arms of the sister chromatids during prophase, allowing the individual sister chromatids to be resolved. Cohesin is retained, however, at the most constricted part of the chromosome, the centromere (Figure 9). During prophase, the spindle also begins to form as the two pairs of centrioles move to opposite poles and microtubules begin to polymerize from the duplicated centrosomes.
Prometaphase
Prometaphase begins with the abrupt fragmentation of the nuclear envelope into many small vesicles that will eventually be divided between the future daughter cells. The breakdown of the nuclear membrane is an essential step for spindle assembly. Because the centrosomes are located outside the nucleus in animal cells, the microtubules of the developing spindle do not have access to the chromosomes until the nuclear membrane breaks apart.
Prometaphase is an extremely dynamic part of the cell cycle. Microtubules rapidly assemble and disassemble as they grow out of the centrosomes, seeking out attachment sites at chromosome kinetochores, which are complex platelike structures that assemble during prometaphase on one face of each sister chromatid at its centromere. As prometaphase ensues, chromosomes are pulled and tugged in opposite directions by microtubules growing out from both poles of the spindle, until the pole-directed forces are finally balanced. Sister chromatids do not break apart during this tug-of-war because they are firmly attached to each other by the cohesin remaining at their centromeres. At the end of prometaphase, chromosomes have a bi-orientation, meaning that the kinetochores on sister chromatids are connected by microtubules to opposite poles of the spindle.
Metaphase
Next, chromosomes assume their most compacted state during metaphase, when the centromeres of all the cell's chromosomes line up at the equator of the spindle. Metaphase is particularly useful in cytogenetics, because chromosomes can be most easily visualized at this stage. Furthermore, cells can be experimentally arrested at metaphase with mitotic poisons such as colchicine. Video microscopy shows that chromosomes temporarily stop moving during metaphase. A complex checkpoint mechanism determines whether the spindle is properly assembled, and for the most part, only cells with correctly assembled spindles enter anaphase.
Anaphase, is the stage of mitosis after the process of metaphase, when replicated chromosomes are split and the newly-copied chromosomes are moved to opposite poles of the cell
Telophase and Cytokinesis
Mitosis ends with telophase, or the stage at which the chromosomes reach the poles. The nuclear membrane then reforms, and the chromosomes begin to decondense into their interphase conformations. Telophase is followed by cytokinesis, or the division of the cytoplasm into two daughter cells. The daughter cells that result from this process have identical genetic compositions.
Answer:
Prophase (From Greek words meaning “before” and “stage”):
Chromatin condenses into 2 visible rod structures, chromosomes, in a process called chromatin condensation (inspired name, right?).
Due to the DNA replication in interphase, there are two identical copies of each chromosome, referred to as sister chromatids, attached by a centromere.
At the end of prophase the nucleolus dissolves.
Technically this next section is classed as a separate stage but for all intents and purposes it is usually bundled up in the end of Prophase and the beginning of Metaphase. It’s called… *drum roll*… Prometaphase.
What happens here is the nuclear membrane breaks apart and chromosomes form structures known as kinetochores. For A-level you don't really need to know about these so I'll stop myself there.
Metaphase (from Greek meaning “adjacent” “stage”):
The centromeres of all chromosomes line up along the equator of the cell. Spindle fibres form between the poles of the cell and the centromeres.
Anaphase (more Greek! Means “up” “stage”):
The centromeres are split and the spindle fibres contract, pulling the sister chromatids to opposite poles of the cell. The chromatids form a V/Y shape as they are pulled backwards.
The cell also stretches into an oval (this movement of the cell is due to non-kintochore spindle fibres pushing against each other, but this is far above A-level).
Telophase (“end” “stage”):
The effects of prophase and prometaphase are effectively reversed here.
Two nuclei form in the cell, at both ends of the cell. Nuclear envelopes are reformed from components of the parent cell’s envelope.
There are 2 theories about how this happen:
Vesicle fusion: fragments of the initial nuclear membrane fuse to rebuild the nuclear membrane
Reshaping of the endoplasmic reticulum
The nucleoli also re-form, any remaining spindle fibres depolymerise and the chromosomes begin to unwind and expand into the chromatin that is seen in interphase.
Cytokenises begins, in which a Myosin II and actin filament ring contract to cleave the cell in two, resulting in two genetically identical daughter cells.
After that, they're both straight back to interphase.
Explanation:
9. Please use the image of embryo development below to answer the following questions. All of the animals below are vertebrates.
Which of the following shows the correct order of development for mammal embryos from left to right? (Left is early. Right is just before birth.) *
A. A
B. B
C. C
D. D
E. E
F. F
can some one help me with this:)
The codes found in DNA, for an organism's traits, are copid by the cells m-RNA by producing special units called codons.
These codons are represented by...
A. Four random nitrogenous bases
B. An anti-codon called t-RNA
C. Base pairs A-T and C-G
D. Three nitrogenous bases in a sequence
Answer:
During this process, the DNA sequence of a gene is copied into RNA. Before transcription can take place, the DNA double helix must unwind near the gene that is getting transcribed. The region of opened-up DNA is called a transcription bubble.
Explanation:
What type of relationship exists between the common teasel and all of the other plants?
Answer:
it pollinates it
Explanation:
the comma teasel is a butterfly that pollinates plants
Explain why a clownfish can touch an anemone when other organisms cannot.
Butterflies are often observed in grassy areas with many flowering plants. They have a long thin, structure called a proboscis, which is used to collect nectar from flowers. Which statement best describes how butterflies would survive in a new area with some tall trees and very few flowering plants?
A Butterflies would survive well in the new area because they rely on other butterflies for food.
B Butterflies would survive well in the new area because trees provide shade for the butterflies.
C Butterflies would not survive well in the new area because they eat food produced by the flowering plants.
D Butterflies would not survive well in the new area because the trees would block the sunlight they need to produce energy.
which of the following statements best explains their results
Answer:
c might be the answer
Explanation:
the question is not clear . for sure its not a. and b they didn't explain it clearly the same thing with d too.