The correct answer is A.
Hunger, chemical imbalance, and blood levels are all internal issues. Cat dander on the other hand is not something the body creates or and is something in the environment.
Thus, your answer is A.
The pigment that turns leaves green is chlorophyll. when chlorophyll leaves the leaves the leaf will turn different colors<span />
Answer: calories?
Explanation: but isn’t it 1 calorie = 4.184 joules of energy
The person above me is correct I took a test on this so it’s the right answer
