2.The death of individuals reduces population size. If births outnumber deaths, the population grows. True
False

True

Explanation:

This would be like a birth to death ratio. If you have more deaths than births your population would decrease. See a similarity?

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.