The two atmospheric gases most important to humans and other organisms are: a) c

Question

The two atmospheric gases most important to humans and other organisms are: a) carbon dioxide and oxygen. b) hydrogen and oxygen. c) oxygen and argon. d) carbon dioxide and nitrogen. e) carbon monoxide and oxygen. Section Reference 1: 19.1 The Atmosphere as a Resource The two main human sources of primary air pollutants are: a) agriculture and residential sources. b) agriculture and industry. c) industry and incineration. d) industry and transportation. e) incineration and transportation. Section Reference 1: 19.2 Types and Sources of Air Pollution The difference between primary and secondary air pollutants is that primary air pollutants: a) only affect plants, secondary pollutants affect plants and animals. b) are not harmful to humans, whereas secondary air pollutants may be toxic to humans. c) enter the atmosphere directly, whereas secondary pollutants form from other substances released into the atmosphere. d) are the direct result of natural processes, whereas secondary air pollutants are the result of human activity. e) are smaller, primary molecules. Section Reference 1: 19.2 Types and Sources of Air Pollution

Explanation / Answer

35)carbon dioxide and oxygen(a).

37)incineration and transportation (e).

38)c) enters the atmosphere directly, where as secondary polluntant form from other substances released in to the atmosphere.

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