If intelligence is so useful, why do so few species have it?

Explanation:

Could intelligence simply be unlikely to evolve? Unfortunately, we can’t study extraterrestrial life to answer this question. But we can study some 4.5 billion years of Earth’s history, looking at where evolution repeats itself, or doesn’t.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

answer: c

explanation: