Which phrase best describes speed? A. Rate of change in velocity.

B. Rate of change in position to motion.

C. Total change in position as described by distance and direction.

D. Rate of motion.

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.

hope it

2b2t

explanation:

2b2t