Explain the difference between osmosis and diffusion and why each of these are crucial process in a cell.

C

Explanation:

Diffusion is the movement of molecule from a place of high concentration to a place of low concentration through a semi-permeable membrane.

Osmosis is the movement of molecules from a place of high water concentration to a place of low water concentration through a semi-permeable membrane

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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.