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They found a part of DNA
Watson and crick found out hereditary molecules.

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Friedrich had to study what he found.

Friedrich's work is important because they found or believed that what he found had some proteins.

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It was hard for women to be scientist and she solve something that no one lese couldn't think of. Her work is it important because it ended up to finding the right conclusion of the DNA strand

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DNA is made up from some type of nucleic acid

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The nucleotide s of DNA are adenine, thymine, guanine, and cytosine.
The three parts of nucleotides are deoxyribose, phosphate, and the base

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Nucleotide s connect with each other by covalent bonds