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What is the opportunity cost of taking a semester long economics class?
Carbon Dioxide
A gas devoid of color and smell, produced from the burning of carbon-containing compounds and the act of breathing. Naturally found in the environment, it is essential for plant photosynthesis.
Atmosphere
The layer of gases surrounding the Earth that is held in place by gravity and is composed of nitrogen, oxygen, and trace gases.
Lower Layer
Refers to the bottom or underneath sections in a stratified structure, such as atmospheric layers, soil profiles, or bodies of water.
Atmosphere
The layer of gases surrounding a planet or other celestial body, held in place by gravity.
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