6. The functions of the vena cava include which of the following? A. returning blood to the atria
O
B. pumping blood into circulation
C. removing excess fluid from the heart chambers
D. anchoring the heart to surrounding structures

Differences between compact bone and cartilage

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.