Question

At the heart of the sun, the temperature and pressure is enough to drive ___________ reactions. These reactions release energy from the surface of the sun by emitting light or releasing high energy particles.

A) fission
B) fraction
C) frisson
D) fusion

Answer 1

I would have to say D. I hope this helps

Answer 2

At the heart of the sun, the temperature and pressure is enough to drive FUSION reactions. These reactions release energy from the surface of the sun by emitting light or releasing high energy particles.
At least, that's what I put on my IA2! I hope this helps:)