How many testes does Pheretima possess?

The epidermis of earthworm is made of __

Which of the following structures protect the eyes of frog in water?

Which of these structures is the upper lip of the cockroach?

Which of these statements is true about the respiratory system of cockroach?

Which of the following statements is false about cockroaches?

In which of the following segments are the blood glands of an earthworm present?

Frogs are __