Answer:
Explanation:
Air pollution can be defined as the presence of toxic chemicals or compounds (including those of biological origin) in the air, at levels that pose a health risk. In an even broader sense, air pollution means the presence of chemicals or compounds in the air which are usually not present and which lower the quality of the air or cause detrimental changes to the quality of life (such as the damaging of the ozone layer or causing global warming).
Their are a lot of occurrence of human activities that do not affect air.
ANSWER: op·por·tu·ni·ty cost
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nounECONOMICS
the loss of potential gain from other alternatives when one alternative is chosen.
"idle cash balances represent an opportunity cost in terms of lost interest"
<span>c. United Nations Development Program</span>
I sure it is b, food production
Answer:
Explanation: Peer review is important because it is to ensure your manuscript is meeting or can be further improved to meet publication standard.