Which factor can increase the chances of a species evolving by natural selection? A. high reproductive rate
B. no related species
C. stable environmental conditions
D. small gene pool

A.

Explanation:

A high reproductive rate means a larger gene pool, and traits which benefit stand above the rest better, and are kept in the population. No related species would allow for only the small gene pool to continue in a slow evolutionary pace. Stable ecosystem does not generally require an organism to adapt.

oxygen +1 most likely

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