Which of the following tissues is derived from all the three germinal layers?

Frogs have a lymphatic system. True or false?

Where are the male genital pores present in earthworm?

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

Organization helps in the efficient and coordinated working of different types of cells. True or false?

Where does fertilization occur for the earthworm?

Which of these statements is true about earthworm?

Open blood vascular system is present in Pheretima.