Question

a student models the layers of a star and notices that fusion only occurs in the core. why is fusion limited to this region?

the photosphere blocks fusion reactions

the outer layers are too dense

the core has the highest pressure and temperature

fusion requires exposure to sunlight

Explanation:

Nuclear fusion requires extremely high temperatures and pressures. In a star, the core has the highest pressure and temperature compared to other layers. The photosphere is the visible surface of the star and does not block fusion. The outer layers are less dense than the core. Fusion is a nuclear process and does not require exposure to sunlight.

Answer:

The core has the highest pressure and temperature.