An atomic nucleus is composed of es
A)
protons.
B)
protons and neutrons.
C)
protons and electrons.
D)
protons, neutrons, and electrons.

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.

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b. climate change will cause an increase in biodiversity of all ecosystems.

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