Which of the following statements is true of crossing-over?

Crossing-over contributes to genetic diversity or variation. Crossing-over is when homologous* chromosomes exchange genes. ... They have the same genes but can have different versions.

c

explanation:

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