_________ are the soft parts under the skin.

The _________system helps us to give birth of young ones?

The heart, blood and blood vessels constitute the__________ system.

Which is called the functional unit of kidney?

Which one is the excretory organ in our body?

The brain is protected inside the 

The nerves, spinal cord, and brain from the 

There are  _______organ systems in our body.

Which is called the pacemaker of heart?

Which is the end part of gastro intestinal tract?