Women earn less than men, on average, because

women on average, earn less than men because men are more likely to hold managerial, administrative, or executive jobs, while women are more likely than men to become stay at home parents, or work in jobs with fewer hours so that they are better able to care for children.

answer: the answer is 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