The answer is that they can't reproduce on their own will.
Explanation:
Answer from: Quest
enzyme active site and substrate specificity
enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products
Answer from: Quest
light dependent reactions:
release oxygen during the photolysis of wateroccur in the granaproduce atp
light independent reactions:
fix carbon dioxide occur in the stromaproduce glucose