Its the Chromosomes, if your talking about the human cells.
Answer:
I'm not sure, but I think it's smoking, or vaping. Or it could be uninetional ingeries. And I would like to be your friend :)
Explanation:
B would be the correct answer
When active in extreme weather you should always mind two things, your outfit and hydration. Keeping yourself hydrated and protected is essential, as wearing a cap and sunglasses can protect you in the sun just like scarves and gloves can protect you in the cold. Hydration is of extreme importance because you can collapse without enough water during a hot weather wave.