In this case the objects must be touching
The answer is D.
An endothermic reaction involves absorbing heat whereas an exothermic involves releasing heat.
A community is where a group of people live really close by vs. a population counts how many people live in a area
I believe the answer is that the CFCs cause low ozone concentrations in the atmosphere.
Sorry if I'm wrong, hope this helps.
Answer:
A system in dynamic equilibrium will have small changes that sum together to produce no net change. Dynamic equilibrium is different from a static equilibrium, in which the parts do not move once they've reached equilibrium.
Explanation: