The greatest threat to most species is
A. the destruction of habitats.
B. water pollution.
C. parasites.
D. the buildup of toxic substances in food chains.
E. flooding.
Answer: A
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The aurora borealis is most closely related to
A. electric fields. B. solar-energy fields. C. magnetic fields. D. gravitational fields.
Explain how a vaccine works.
What will be an ideal response?
True or False: Gaps in the rock record are of no importance to geologists because no rocks exist from the gap to be studied
Indicate whether this statement is true or false.
The carrying capacity is the ________
A) maximum sustainable population that a given environment can support B) limitation on numbers of species in a community C) greatest number of different niches possible in a given area D) average number of offspring carried to term by a species E) potential growth in the number of species in a given area