World Geography
The ozone layer at high altitude contains

only ordinary oxygen (O2)
mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3)
only ozone (O3)
atomic oxygen (O) and ordinary oxygen (O2)

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World Geography
Which among the following statements is/are correct about the symbiotic life of Corals?Algae gives carbon dioxide and other substances the  coral polyp needs.Coral polyp gives off oxygen and other nutrients that the algae needs.Select the correct code from the options given below:

Neither 1 & 2
Both 1 & 2
Only 2
Only 1

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