Evaluate the paragraph that examines the relationship between MHC molecules, T cells and B cells. Choose the correct answer from the choices given.

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

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.