Which part of a green plant loses the most chloroplasts at the end of summer?

A green plant's leaves lose most of their chloroplasts at the end of the summer.

Explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

the animal that would be cutest if scaled down to the size of a cat? elephant