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Vlad [161]
3 years ago
14

Please help As fast as you can!

Biology
1 answer:
Afina-wow [57]3 years ago
5 0
The answer is c because boy have the same rock layer you can use they key to help you
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Organize the levels of classification listed below in descending order.
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The purine bases are :
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Explanation:

They are  double <u>double carbon- nitrogen rings with  four nitrogen atoms</u> bases  found  in  DNA and RNA. Purines always pair with pyrimidines(cytosine and thymine)  to form a double helix structure.This precise paring ensured that the DNA has a complementary structure.

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