How could silvia enter the "sandwich generation? " a. have her youngest child finally go to college, leaving her at home with just her husband. b. enter a nursing home. c. have her father move in with her while she is still caring for a child at home. d. get married?

The last one (d) I think it is the correct one

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