(A) The development of the cockroach $(Periplaneta \text{ } americana)$ is paurometabolous,meaning development occurs through the nymphal stage. The

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(A) The development of the cockroach $(Periplaneta \text{ } americana)$ is paurometabolous,meaning development occurs through the nymphal stage. The nymph grows by molting (ecdysis). The nymphal stage undergoes molting $13$ times to reach the adult form. Therefore,the correct answer is $13$ times.