How many types of nephridia are present in the earthworm?

What are earthworms commonly called as?

The structure of the cell varies according to which of the following?

Where are the cardiac muscles found?

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

How many ovaries are present in an earthworm?

In frogs, chyme is passed to the __

Which of these characteristics of frog is the reason for its short alimentary canal?