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solniwko [45]
3 years ago
8

Purines and pyrimidines are

Biology
1 answer:
il63 [147K]3 years ago
7 0

Answer:

answer to the question is B

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3 years ago
The greenhouse and enhanced greenhouse effects refer to the return of approximately ______ percent and greater than ______ perce
Sunny_sXe [5.5K]

Answer:

The greenhouse and enhanced greenhouse effects refer to the return of approximately <u>80</u> percent and greater than <u>80</u> percent of the heat radiated by Earth.

Explanation:

During natural greenhouse effect :

. Solar radiation reaches the earth

. Re-radiation of heat occurs

. Less re-emitted heat

. More heath escapes into space

Hence the greenhouse effect refers to return of 80% of heat radiated by Earth.

While during Human Enhanced Greenhouse effect :

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. Re-radiation of heat occurs

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Hence the enhanced greenhouse effect refers to return of more than 80% of heat radiated by Earth .

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Abiotic

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