Which term is not associated with sound wave? 

This organelle of the human body is known as the ‘powerhouse of the cell’. Name it from the given options.

Which proteins is main constituent of milk?

Is there concentration in the eye? 

From whom do teeth and bones gain strength and firmness?

An element that does not occur in nature but can be produced artificially is 

What enzyme occurs in human tears , causing bacteria to die ? 

The term ‘ecosystem’ was proposed by—