Answer:
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Explanation:
Wrap your specimen in the original wrapping and give it your instruct to dispose of
Answer:
Charles Darwin and Alfred Russel Wallace
Answer:
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Explanation:
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D. it serves as a link between membrane proteins on adjacent membranes.
