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Nucleotides are organic molecules consisting of a nucleoside and a phosphate. They serve as monomeric units of the nucleic acid polymers deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), both of which are essential biomolecules within all life-forms on Earth.
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the limestone is the youngest, and therefore the top most rock layer found at the Grand canyon
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over land in polar regions
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Im not sure if this is correct so sorry if its not.
