Answer:
They provide food for living things.
Some aid in the nitrogen cycle.
The most important is that they decompose organic material.
Explanation:
polyp should be the answer
In a nutshell:
- Chemical reactions love stability.
- Usually if heat is given off, the chemicals are happier as they are more stable.
- This should happen naturally, like a ball rolling down a hill.
- But if you <em>force </em>chemicals to do things that make them more <em>unstable, </em>you're going to have to put energy in.
- Like forcing a ball up a hill, it isn't naturally going to roll up without you putting in energy.
- "exo-" means "away from" and "endo-" means "within". Think about this in terms of heat, or energy.
- heat released -> exothermic reaction (energy escapes)
- heat put in -> endothermic reaction (energy is put within)
Also the word "enthalpy" and ΔH is used a lot to relate to energy.
A negative ΔH means heat loss and a positive ΔH means heat put in as well.
Hope this helps ;)
