What must happen for heat to be transferred by thermal conduction A. Two molecules must collide with each other.
B. The sun must send out electromagnetic waves.
C. The kinetic energy must be equal in two objects.
D. The liquid or gas must circulate to move the heat.

B. The sun must send out

Explanation:

c is the answer because when something is left after something evaporates that shows the chemical change.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates