Why should people be concerned about the extinction of a species? A.The extinction of a species is an opportunity for new species to emerge. B.The extinction of a species upsets the balance of ecosystems. C.The extinction of a species increases overall biodiversity. D.The extinction of a species can be reversed with captive breeding.

B. The extinction of a species upsets the balance of ecosystems.

the answer is letter (B)

B; The extinction of a species upset the balance of ecosystem

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The Answer is C

Explanation:

When scientists breed cows to produce more milk, this has not occured naturally and thus is not natural selection.