Answer :
In the sun nuclear reaction called proton-proton cycle occurs. During these processes four hydrogen atoms are combined in a series of reactions to form one Helium atom; this chain of reactions is coupled by release of energy in the form of gamma rays and other particles called neutrons. Therefore, i believe the appropriate answer would be, nuclear reaction fuse atoms of hydrogen to make helium atoms.
Answer:
The answers are generate light, generate heat, fuse atoms of hydrogen to make helium atoms. That other answer over there didn't select all that apply, because they have a dumb stinky brain.
Explanation:
The main source of heat on earth is the sun. The sun is made mostly of hydrogen and helium. Nuclear reactions within the sun change hydrogen atoms into helium atoms. This process releases a tremendous amount of energy in the form of heat and light.