Answer: citizenship would be conferred only on children whose mother and father both were Athenians. .
Explanation:
In 451 B.C. Pericles introduced one of most striking proposals with his sponsorship of a law stating that henceforth citizenship would be conferred only on children whose mother and father both were Athenians. Previously, the offspring of Athenian men who married non-Athenian women were granted citizenship.
Over fishing means that a primary food source for other animals is now limited due to over fishing and that the fish population is slowly decreasing, and it can interrupt the food web.