Which best describes an element? a pure substance
a type of a mixture
a pure compound
an impure substance

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An element is

It is the purest and most basic form of any substance on Earth. ... Elements are atoms that are made of subatomic particles known as protons, electrons, and neutrons.

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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