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OK-Environmental Science-Sem B -CA- 36431B
Unit Test — Unit test
Question 21
21
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Unit Test — Unit test
Question 21 • OK-Environmental Science-Sem B -CA- 36431B
Which gases contribute to the greenhouse effect?
Answer
A
nitrogen and helium
B
carbon dioxide and methane
C
carbon dioxide and helium
D
nitrogen and methane
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