<span>im not sure but ig cells, organs, and organisms</span>
Answer:
A. is the organism able to respond to stimuli
Explanation:
C is da answer.................
Also, intersexual selection, or mate choice, occurs when females choose between male mates. Traits selected by male combat are called secondary sexual characteristics (including horns, antlers, etc.), which Darwin described as "weapons", while traits selected by mate (usually female) choice are called "ornaments".
The tree is the "Producer" while caterpillar is "Primary consumer" and the bird is "Secondary consumer".