The answer is A in the cell wall
Rafflesia arnoldii, the corpse flower or giant padma, is a species of flowering plant in the parasitic genus Rafflesia. It is noted for producing the largest individual flower on Earth. It has a strong and unpleasant odor of decaying flesh. It is native to the rainforests of Sumatra and Borneo.
I believe the correct answer is A. Increases the rate of a chemical reaction. This is because they act as catalysts.
The answer is (y-7x)(7x+y)
It is this because you must have y^2 which is two y's thats why there is two y's in the answer and -7 and 7 because -7×7= -49