A keystone species is an organism that ________.

A. lives in coastal regions
B. is very abundant
C. plays a crucial role in an ecosystem
D. is endangered


Answer: C

Environmental & Atmospheric Sciences

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Cyclones in the Northern Hemisphere are ________ air flows

A) clockwise B) counterclockwise C) north-flowing D) south-flowing E) mythical

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An area distinguished by one or more unique characteristics is a(n)

A) biome. B) landscape. C) region. D) uniform unit. E) ecosystem.

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We know that the mantle is not molten because P-waves can travel through it

Indicate whether the statement is true or false

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