Which organisms obtain heat primarily from the external environment?
a. endotherms
b. ectotherms
c. exotherms
d. isotherms
Answer: b. ectotherms
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Scientists develop a chemical that binds to molecules that make quorum sensing possible, rendering those molecules non-functional. If this chemical is incorporated into a mouthwash, how would it affect the community of bacteria that cause dental plaque?
A. Their negative effects would be reduced because they will no longer be able to produce mucilage and stick to teeth. B. Their negative effects would be reduced because they will no longer be able to produce the acid that damages teeth. C. Their negative effects would be increased because it will cause them to produce mucilage, allowing them to stick to teeth. D. Their negative effects would be increased because it will cause them to produce the acid that damages teeth. E. It would have no effect because they will still be able to form a biofilm and secrete the acid that damages teeth.
Based on what we know today, what is the best explanation for why the emu, ostrich, and rhea are so similar despite
being geographically separated? What will be an ideal response?
Suppose Priestley repeated his experiment using many kinds of plants besides mint, and that when different plants were placed under the jar the candle remained lighted for different periods of time. What would be a logical conclusion from these experiments?
a) Different plants require different amounts of water. b) Different plants release different amounts of carbon dioxide. c) Different plants require different amounts of light. d) Different plants release different amounts of oxygen.
When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of
A) density-dependent regulation. B) exotic regulation. C) ecosystem carrying capacity. D) density-independent regulation. E) community carrying capacity.