Hydrogen bonds break down.
hope it helps.
Anatomical structure, possible diet, and reproduction evidence.
20 percent available at the highest tropic level. There is less at the top of the food chain because it has ate things from possibly all areas of the food chain and each level is consuming from lower parts of the chain than it. So with the entire food chain eating on what the top eats there is gonna be less for the top
Everything that surrounds us is our environment
Lightning I think. I don't understand the question
