Questions

The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water and other gases.

Earth's atmosphere is composed of many gases. Their percentages by volume is given by::

 
78% Nitrogen,

21% Oxygen,

0.9% Argon, and

0.03% Carbon dioxide 

And very small percentages of other elements.

Polypeptides are assembled from Aminoacids.

The southern state Telangana decided to make way for electric cars to promote non-polluting vehicles.

To organize ads by common themes that you want to advertise on.

Haemoglobin is a protein what carries oxygen in the blood and contains iron metal in it.