Why do arctic plants make the most energy storage molecules (sugar molecules) during the summer?

Because the sun never sets in the summer, Arctic plants can photosynthesize 24 hours a day, constantly producing energy storage molecules that are stored in their bodies, available for animals to eat.

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the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.