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Two critical requirements must be met before light elements, like hydrogen or helium, will fuse and form heavier elements. The two requirements for nuclear fusion are
A) high energy and low density.
B) extreme temperatures and low density.
C) extremely high temperature and density.
D) strong gravitational forces and high density.

Respuesta :

the answer is c

c)extremely high temperature and density

Answer:  C) extremely high temperature and density.

Explanation: Nuclear fusion occurs in the sun and stars under two conditions: extremely high temperature and density. The high density helps to raise temperatures to 15 million K and that in turn, causes the ionization of hydrogen. The heat causes the ionized nuclei to collide and fuse.