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Daniel [21]
3 years ago
13

What is the most effective way to increase the oxygen content of air ?

Biology
1 answer:
yKpoI14uk [10]3 years ago
5 0
More plants that produce oxygen.
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Answer: The correct answers are-

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Random changes in allele frequency in a population are called:
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All the other cases; answers, here aren't correct and don't apply. 
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The four main elements in food that help energy to move from One trophic level to another is
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