Opportunity cost is a concept in economics and it refers to the cost of something that has to be given up to enjoy something better. This can be for example the benefits of second best alternatives (when the first best is chosen) or alternative use of something, which is not decided on (the cost of not using land for farming and using it for building a house instead).
Answer:
Most fires were due to human error from the years 2001 to 2010
I think that this is sort of like how the USA has its government set up. It chooses some leaders to make decisions.
Depression. they suffer from depression
Answer:
Enzymes
Explanation:
The enzymes in the stomach protect it.
