Those dinoflagellates that live in an intimate association with corals are called ________.
A. zooxanthellae
B. parasites
C. phytoplankton
D. lichens
Answer: A
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Nematocysts are found only in
a. cnidarians. b. roundworms. c. crustaceans. d. echinoderms. e. arthropods.
Biological wealth is the source of
a. food. b. medicine. c. ecotourism. d. economic opportunity. e. all of these.
All of the following are true regarding ammonia
EXCEPT that a. it is toxic to cells. b. it is a normal product of amino acid breakdown. c. the liver detoxifies it. d. the liver converts it to urea. e. it is expelled by the respiratory system.
The primary cost of tanning is ______________________
a. the energy needed to produce melanin b. the time needed to lay in the sun c. the money needed to purchase sunblock d. All of the above are equally costly e. I don't know the answer