Question

The human body has an organ A which acts as a pump. The organ A pumps a
liquid B in to the whole body continuously. The liquid B supplies useful substances C
and D to all the body cells and removes waste E from the body cells.
1. What are A and B?
2. Name the useful substances C and D.
3. What is the waste E?

Answer 1

Heart is the organ A.
Heart pumps a liquid that is denoted by B, and it is blood.  
Blood supplies oxygen and nutrients.
These two are C and D, which are called useful substances.
The color of the liquid B is red because of the presence of RBC red blood corpuscles.
The waste is carbon Dioxide, which is removed by blood from the cells.

HOPE IT HEPLS YOU :)

Answer 2

A-Heart

B-Blood

C-oxygen

D-nutreints like glucose

E-Carbondioxide

    Explanation:

• The human body has an organ heart which acts as a pump its function is to pump oxygenated blood to all part of our body for there proper functioning through arteries they provide this oxygen carrying blood to every cell of our body for cell mechanism and take the waste carbon dioxide from tissues to lungs and heart again through veins.