The answer is because it lowers the number of chromosomes in half, ensuring that the fusion will have the appropriate amount of chromosomes after the fusing of the sperm and the egg.
I think B. thermal energy.
When we heat up a substance, we increase the motion or vibration of the particles.
Answer: PHYSICAL change
Explanation: chemical changes usually have to do with air and pollution and things like that.
Any small molecule that can bind in a specific manner to a larger one.
Substances are made of basic particles called atoms