How many main parts does human brain have?

Which is the colored part of the eye?

Which is our largest sense organ?

We smell with help of our :

How long does it take for the eyes to adjust to darkness?

How many type of blood vessels are there in the human body?

We feel with our :

We speak with the help of our:

How many parts does human  ear have?

Thin tubes that carry blood to all parts of our body are called: