Can some plants can be grown from stem cuttings

Yes. Only if the conditions are suitable.

Explanation:

Stem cutting produces new roots and new stems.

it is either c or d and i know for sure it is not a or b

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