What are three factors that often change at a front

temperature, air pressure and water

Explanation:

Not 10000000% but i'm in 11th grade so i think i learned this at one point in my life. Hope it helps.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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there are no statements provided but here is why:

sulfur belongs to group 16 because it can be found in nature whether it is in a free or combined state.

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