Multiple Choice Questions: 1. A 1/1,000,000 species per year extinction rate, wh
ID: 158822 • Letter: M
Question
Multiple Choice Questions:
1. A 1/1,000,000 species per year extinction rate, which is the estimated average rate of extinction in the history of life on earth, is called _____ extinction.
(a). background
(b). total
(c). ecological
(d). local
(e). biological
2. Which of the following is NOT a reason scientists give for their prediction that extinction rate will continue to increase in the future?
(a). population increase and per capita resource consumption
(b). generation of new species through genetic modification
(c). simplification of complex habitats
(d). encrochment onto biodiversity hotspots
3. The process by which chemicals ingested by species in the lower trophic levels of an ecosystem build up in organisms in higher trophic levels is called?
(a). CITES
(b). specialization
(c). fragmentation
(d). bio-accumulation
(e). invasion
Explanation / Answer
1. A 1/1,000,000 species per year extinction rate, which is the estimated average rate of extinction in the history of life on earth, is called _____ extinction.
answer) background extinction.
2. Which of the following is NOT a reason scientists give for their prediction that extinction rate will continue to increase in the future?
answer) generation of new species through genetic modification
3. The process by which chemicals ingested by species in the lower trophic levels of an ecosystem build up in organisms in higher trophic levels is called?
answer) d) bio-accumulation : Process by which certain toxic substances (such as heavy metals and polychlorinated biphenyls) accumulate and keep on accumulating in living organisms, posing a threat tohealth, life, and to the environment.
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