Blood returning to the mammalian heart in a pulmonary vein drains first into the _____

A) vena cava
B) left atrium
C) right atrium
D) left ventricle
E) right ventricle


Answer: B

Biology & Microbiology

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Which theory explains how hydrogen bonding allows water molecules to maintain a continuous fluid column as water is pulled from roots to leaves?

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Refer to the accompanying figure. Which of these lungs would be best for an animal that is fairly active?

a. 1 b. 2 c. 3 d. 4 e. Any of these.

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Which of the following mechanisms of succession involves the establishment of species independently of the presence or absence of other species?

A) facilitation B) inhibition C) tolerance D) none of the above

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