Have thin and flexible primary cell walls, perform the most metabolic functions (including photosynthesis), and retain the ability to divide and differentiate into other cells

Parenchyma cells

Explanation:

The parenchyma cells of plants are the functioning cells organ-tissue of non-woody part of soft plants and fruits.

The structure of the parenchyma cell consist of thinner walls and retain the ability to divide quickly, differentiate into other cells and stay alive at maturity. Parenchyma cells are less useful in structural part of plants but capable of photosynthesis, store water and nutrients.

The aggregate of parenchyma cells form a majority of ground tissue in the plant. They cells of parenchyma are capable of metabolic activity, such as growth and photosynthesis

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sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.