<span>Purines and pyrimidines form hydrogen bonds between each other. Certain polar chemical groups form electrostatic interactions or hydrogen bonds. The A-T and C-G pairings form the hydrogen bonds between the amine and carbonyl groups on the complementary bases.</span>
Answer:
1/1000 babies, and 1/150 African American births have this defect.
Explanation:
The part that makes you yawn is the reticular
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