Answer:
6. Because of how old the rocks are
Explanation:
6. Sedimentary rock forms in layers because of the order they were formed. The older rocks will form first and as time goes on, rock forms above it to create a new layer, and so on.
1.) A nucleotide of DNA consists of a sugar, a phosphate, and a nitrogen containing base.
2.) A mutation is a change in the base sequence of a DNA molecule
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