"What nutrient deficiency is responsible for

Which cells are responsible for producing the myelin sheath in the nervous system?

Which vein carries oxygen-rich blood from the lungs to the heart? 

What does histology study?

Which of the following is not classified as a Bio-fertilizer?

Athlete's foot is caused by:

What is the strongest bone in the human body?

The Sun and the stars glow because of the presence of __________ in them.

Fermentation is a 

What is essential for maintaining pregnancy in women?

In Photography, which chemical used as a fixer.