Answer:
There is no mixing of oxygen-rich and oxygen-poor blood.
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The right atrium and right ventricle of the human heart pump oxygen-poor blood to the lungs and the left atrium receives oxygen-rich blood. They never mix.
A group of rhinoceros is called a "crash".
Answer: Stomata densities change in response to changing atmospheric levels of carbon dioxide. Stomata may also vary in response to the amount of annual rainfall in different localities.
Explanation:
