Isotopes are atoms that have the same but different? A. Mass number, atomic number

B. Atomic number, mass number

The answer is B

biology is the study of life. it is the study of living organism.

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