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Explanation: The sugar and phosphate group make up the backbone of the DNA double helix, while the bases are located in the middle. A chemical bond between the phosphate group of one nucleotide and the sugar of a neighboring nucleotide holds the backbone together.
Main chemical Change explained by Lavoisier
Idk the timeline but from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.
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Hope the above picture might help you :)
