Leaves change color due to changes in length of daylight and changes in temperatures, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.
Sources - Google
Answer: When no oxygen is present, the electron transport chain can't run
Explanation: I know this because I am in biology and I am passing with a 99
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