All of the elephants living in a wildlife preserve would be considered a

All of the elephants living in a wildlife preserve would be considered a population.

Explanation:

A population is defined as the whole number of animals in a region. In this example, the total of elephants living in an area or region (wildlife preserve) are part of a population. Also, the members of that population found there are able to interbreed with each other.

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the answer for this question would be d. glaciers