Which statement is true?

a. All animals with hearts have closed circulatory systems.
b. Birds and crocodiles have pulmocutaneous circulation.
c. All blood circulated through fish hearts is deoxygenated.
d. Double circulation is a feature of all mammals and some birds.


c. All blood circulated through fish hearts is deoxygenated.

Biology & Microbiology

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The acquisition of a relatively small amount of genetic material from an organism that is not a parent of the receiving organism is most specifically referred to as:

A. vertical descent. B. horizontal gene transfer. C. endosymbiosis. D. parasitism. E. Darwinian evolution.

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What percent of the known animals on Earth are invertebrates?

a. 15% b. 56% c. 89% d. 33% e. 97%

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Aldosterone is most similar in its effect to what

other hormone?

a. calcitonin b. insulin c. cortisol d. anti-diuretic hormone e. growth hormone

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Which vitamin is converted to its active form in the kidney?

a. A b. B12 c. C d. D e. E

Biology & Microbiology