Which of these is not a secondary lymphoid organ?

Using earthworms to increase soil fertility is called __

How many testes does Pheretima possess?

The human body is composed of how many cells?

What types of tissues does the heart contain?

Segments 18-19 are called as clitellar segments.

What type of tissue does the given figure represent?

Where is the female genital pore present in earthworm?