Which of the following animals could be considered a member of these loons' population?

a.
the chick of another loon living near crystal lake
b.
a 15-year-old male loon living near firefly lake
c.
a six-month-old bluegill living in crystal lake
d.
a female loon that lived near crystal lake 40 years ago

A. The chick of another loon living near Crystal Lake

Reason: B is incorrect because it is not in the same lake

C. Is incorrect because a bluegill is not the same species, therefore it does not contribute to the loon population

D. Is incorrect because that was 40 years ago, and is not current. That loon no longer contributes to the loon population.

A is the answer to this question. Hope this helps!