The main source of Sun’s energy is

An immediate and intense type I reaction that can be treated with antihistamines is characteristic of __________. 

A star which is 50 times as massive as our Sun is more likely to undergo

The particles arriving on earth from nuclear reaction in the center of our sun include

The principal enzyme for breaking down carbohydrates is ________.

Necessary for Vitamin B12 absorption, ________ is/are secreted by ________ cells.

The corona of our Sun becomes visible during

A neutron star was first detected because

The color of the sunspots is due to

The force of gravity is stronger on the surface of