Open blood vascular system is present in Pheretima.

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

The head of the cockroach is flexible due to a flexible neck. True or false?

How can we distinguish the ventral surface of the earthworm by their dorsal surface?

For how long will a cockroach survive if its head is cut off?

Which of these is not a function of ear in frog?

Which of these is not present in frog?

Hepatic portal system and Renal portal system are present in the frog.