Why some of the organs in human body are most valuable?

The number of ribs in human body is

Most of the neurons of our body are

Define vestigial organs. Write names of some vestigal organs in human body and write the names of those animals in whom same organs are functional.

Largest gland of human body is

What is the role of prontosil in human body ?

Blood in human body is pH of

Location of lymph nodes in human body.

Answer the following question: Define vestigial organs. Enlist such organs in human body. How the same organs are useful in other animals?

Vestigial organ of human body is…………. .