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
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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
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
Which gasses are considered "greenhouse gasses"?
a. carbon dioxide b. ozone c. methane d. nitrous oxide e. all of these
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