How do terrestrial animals prevent toxic accumulation of ammonia in their tissues?
a. They use ammonia in other metabolic processes.
b. They convert ammonia to less toxic forms.
c. They vent ammonia across the body wall.
d. They eliminate ammonia rather than excreting it.
e. Animals do not produce ammonia
B
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The ________ are drugs that deposit in developing teeth and cause a permanent brown discoloration.
A. tetracyclines B. penicillins C. streptomycins D. cephalosporins E. macrolides
All of the following are germ layers EXCEPT
a. ectoderm. b. mesoderm. c. epiderm. d. endoderm.
Signals from the parasympathetic nervous system would cause a(n):
a. widening of pupils b. increase in pulse rate c. increase in digestive system movements d. rise in blood sugar level e. rise in metabolic rate
Four of the five answers are correct statements about materials in biogeochemical cycles. Select the exception
a. They pass from environmental reservoirs to living organisms. b. They move slower than elements in living systems move. c. They eventually move from living organisms back into environmental reservoirs. d. They may include rocks and sediments, waters, and atmosphere reservoirs. e. They are unidirectional, moving from the environment to living organisms.