Which of the following statements is true?

a) acquired mutations are passed down from parent to offspring.
b) mutations are the only way to add new genes to a gene pool.
c) hereditary mutations are caused by external factors, such as radiation.
d) only somatic mutations are important to evolution because they can be inherited.

it's either b or a I just studied this I believe its b though I know it's not d becuade hereditary mutations are passed dow. from parents not outside sources and it's not d because it's not true

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