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Anit [1.1K]
3 years ago
15

During the _________ period, the first vertebrates appeared on Earth.

Biology
2 answers:
Dmitrij [34]3 years ago
8 0
C is your answer
hope this helps
natita [175]3 years ago
4 0
Hello,

Your brainliest answer would be:

D. Devonian

Plz mark me brainliest!

Hope this helps!
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What do you notice about the ecological footprint of the United States compared to other countries?
Anton [14]

Answer:

It's large compared to other countries, but only because of consumerism

Explanation:

The United States is the 5th largest ecological footprint in the world, with about half the population contributing to that factor, however this is only because the United States runs specifically on capitalism and consumerism, so every citizen contributes one way or another. America uses high energy and fossil fuel consumption with high functioning biological resources in carbon cycling. So although comparing California to France (because California has a larger footprint.), it's not a fair comparision due to technology

4 0
4 years ago
Describe the flow of blood in the human body, including through each of the four chambers of the heart. explain how the blood ch
klemol [59]
Flow through the heart: 
Blood enters into the heart through the Superior and Inferior Vena Cava into the Right Atrium. Then from there goes through the Tricuspid Valve into the Right Ventricle, then through the Pulmonary Valve into the Pulmonary Artery and out of the heart to the lungs. Then enters back into the heart through the Pulmonary Veins and into the Left Atrium then through the Mitral Valve down to the Left Ventricle. From there pumps through the Aortic Valve into the Aorta and out to flow throughout your body.

The simple way of explaining the flow throughout the body:
It flows out of the Aorta through Arteries that take your blood throughout your body. The Descending Aorta is large and carries blood downward into more arteries that flow through all of your organs and down to your Pelvic Region to the Iliac Artery and down through your lower extremities through the Femoral Artery. Then there's the Carotid Artery that takes the blood up from the Aorta to our neck and brain. and goes into the arms through the Subclavian Artery. Once it does all this it transfers back from the arteries to the veins. The blood from the arteries goes into little arterioles which is connected to small capillaries and on the other side of those capillaries are Venules which connect to the veins. Then blood is draw into the heart from the veins and the process starts all over again. Crazy that all of this happens each time you feel you feel your heart beat.
7 0
4 years ago
Read 2 more answers
Primary producers are organisms that
Aleks [24]
The answer is B, use energy they take in from the environment to convert inorganic molecules into complex organic molecules.
6 0
4 years ago
Which term identifies the cell’s ability to maintain its internal conditions? transport diffusion osmosis homeostasis
soldier1979 [14.2K]

Answer: Homeostasis

Explanation: The process of homeostasis is when self-regulation occurs in order to keep balance while adapting to changes.

8 0
3 years ago
a race car driver drives one lap around a track that is 500 meters in length. what is the drivers displacement at the end of the
sleet_krkn [62]

Answer:

0 meters

Explanation:

When we talk about displacement, think that the think of it as the measure of the distance between the starting point of the object, from its end point.

Since we are talking about a lap around a track, it would mean that the starting point is also the end point. So if you started and end at the same point, the distance between it would be 0.

5 0
3 years ago
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