The "background" species extinction rate
A. estimates how many extinctions humans are causing.
B. estimates how quickly species disappeared before human intervention.
C. measures today's extinction rate of animals.
D. measures today's extinction rate of plants.
E. All of the answer choices are correct.
B. estimates how quickly species disappeared before human intervention.
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Which of the following is NOT a way that many terrestrial ectotherms regulate their temperature?
a. moving into or out of the shade b. panting c. changing the angle of the body relative to the sun d. changing blood flow to the skin e. thermoregulation
In humans, brown adipose tissue is used for
a. nitrogenous waste processing. b. controlling blood pressure. c. nonshivering thermogenesis. d. digestion of fats. e. cooling the body when exposed.
Red muscle appears that way due to the presence of
a. hemoglobin. b. iron. c. myoglobin. d. ATP. e. glucose.