The process by which toxic substances can be concentrated in the flesh of organisms at higher trophic levels is called ____
A) biomagnification
B) natural selection
C) trophic concentration
D) consumer distillation
A
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The origin of dust devils would be most similar to
A) tornadoes. B) haboobs. C) microbursts. D) virga.
Soil air supplies plants and microorganisms with what gases needed for life processes?
a. nitrogen and helium b. oxygen and methane c. carbon dioxide and oxygen d. nitrogen and carbon dioxide
Two species of frogs do not interbreed because one species breeds in March and the other species breeds in May. This is an example of
A) allopatric speciation. B) sympatric speciation. C) a prezygotic reproductive barrier. D) a postzygotic reproductive barrier.
During the last two million years, there have been at least ____________________ warm-cold cycles. Fill in the blank(s) with the appropriate word(s)