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

Environmental & Atmospheric Sciences

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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.

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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

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Explain how a vaccine works.

What will be an ideal response?

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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.

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