Answer:
Adenine and guanine are purines, while thymine, cytosine and uracil are pyrimidines.
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Sugar-phosphates and nucleotides
Answer:
A. Rock pieces
Explanation:
Abrasion is the breaking down and wearing away of rock material by the mechanical action of other rocks. Three agents of physical weathering that can cause abrasion are moving water, wind and gravity. None of those are agents of abrasion. But Rock pieces are a result of abrasion.
