Aneeds a host to survive

i think it is true in my reasonment ..

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

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.