What is the difference between vascular and nonvascular plants

a vascular plant has vascular vessels to carry water and food to all the different parts of the plant.

the answer for this question would be d. glaciers

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