Which one of the following is correct?

__________ is known as brain of computer.

Our legs and arms are called

The above picture shows:

Computer shown in the  above picture is

______________ pumps blood to all over our body.

A _____________ is land with relatively low relief that is flat or gently rolling.

_____________ is a landscape or region that receives low rainfall.

___________ is any piece of sub-continental land that is surrounded by water.

Find the odd one.