A species whose role in an ecosystem is vital to the abundance of other species in an ecosystem is called a(n)

A. indicator species.
B. native species.
C. keystone species.
D. specialist species.
E. nonnative species.


Answer: C

Environmental & Atmospheric Sciences

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What will be an ideal response?

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The rain-shadow effect on the Isthmus is most pronounced

A) in the summer, on the Pacific side of the Isthmus. B) in the winter, on the Pacific side of the Isthmus. C) in the summer, on both sides of the coasts of the Isthmus. D) in the winter, on both sides of the coasts of the Isthmus.

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On September 22, the length of daylight:

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Answer the following statement true (T) or false (F)

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