Please answer this and explain why :)

the answer is d

Explanation:

in all the other situations, the chemical make of the substances changes but in the last one, you're just freezing salt water. Freezing something is a physical change because the chemical formula of the substance doesn't change.

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

what's the