They help to break down substances into a harmless substance that can be used by the body. without enzymes your body could not break down these substances.
Answer:
D
Explanation:
temperature can change the arrangement of the protein molecules which is called denaturation. thus changing the shape for the protein receptor.
equation of cellular respiration
C6H12O6+6O2--->6CO2+6H20
from this equation we can see that co2 is a product so the answer is C