What percentage of the total energy consumed was converted to forms that were unusable to the chipmunk?

a

explanation:

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 think the answer is a.keratin is the pigment responsible for skin color.