What process has been used for centuries by farmers to produce the breeds that most suit their needs?

a.
creating mutations

b.
gene therapy

c.
selective breeding

d.
genetic engineering

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.