Which of the following is closely associated with the exchange functions of the digestive, respiratory, and urinary systems?

A) the skeletal system
B) the circulatory system
C) the reproductive system
D) the muscular system


Answer: B

Biology & Microbiology

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Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with _______ in Africa.  

A.  plants B.  diseases C.  parasites D.  humans

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The protein dystrophin is produced ____________________

a. at the ribosomes in the cytoplasm b. in the nucleus of the cell c. in the Golgi complex of the cell d. in lysosomes

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Which gasses are considered "greenhouse gasses"?

a. carbon dioxide b. ozone c. methane d. nitrous oxide e. all of these

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Net primary productivity is greater in areas with a long photosynthetic period than in areas with a short photosynthetic period

Indicate whether the statement is true or false

Biology & Microbiology