Why is natural vegetation important

Vegetation serves several critical functions in the biosphere, at all possible spatial scales. First, vegetation regulates the flow of numerous biogeochemical cycles, most critically those of water, carbon, and nitrogen; it is also of great importance in local and global energy balances.

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Vegetation serves several critical functions in the biosphere, at all possible spatial scales.

Explanation: Vegetation regulates the flow of numerous biochemical cycles, most critically those of water, carbon, and nitrogen; it is also of great importance in local and global energy balances.

d is the logical answer but im not a 100% sure

i'm sure the answer you are looking for would be

a. an ice age

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