a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
Answer:
D. chlorophyll, is the best answer
Explanation:
In fall, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible
Hope this helps!
Humans even though i dont believe in evolution but that is the scientific answer