The difference between a point mutation and a chromosome mutation is a nucleotide is changed

a nucleotide is removed instead of added

the amount of DNA that is changed

there is no difference

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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

i guess because there isn't enough love going around. < 3