CTET 2 Social and Science 27 Dec 2021 Paper

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Question : 52 of 150

Marks: +1, -0

Choose the correct statement.

Oxygen is the most plentiful gas in the air.
Oxygen content in the air remains constant as humans and animals take it and plants produce it.
Oxygen is called a greenhouse gas.
Increased level of oxygen results in global warming.

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