It is the ozone layer, good luck! :)
B.) A food chain shows only a single pathway of energy.
Remember that food web are made out of lots of food chains combine. Food chain is only one pathway.
Answer: Clouds form when rising air, through expansion, cools to the point where some of the water vapor molecules "clump together" faster than they are torn apart by their thermal energy. Some of that (invisible) water vapor condenses to form (visible) cloud droplets or ice crystals
Explanation:
The brain is connected to a bunch of nerves through the spine, u can feel through there