Though plants, fungi, and prokaryotes all have cell walls, we place them in different taxa. which of these observations comes closest to explaining the basis for placing these organisms in different taxa, well before relevant data from molecular systematics became available?

a. some closely resemble animals, which lack cell walls.
b. some have cell walls only for support.
c. some have cell walls only for protection from herbivores.
d. their cell walls are composed of very different biochemicals.
e. some have cell walls only to control osmotic balance

Their cell walls are composed of very different biochemicals.

Explanation:

Biological classification is important to classify the organisms on the basis of their similarities and differences between them. Linnaeus is known as the father of biological classification.

Cellwall plays an important role in the maintenance of structure and function of the organisms. The composition of the cell wall of fungi, plants and prokaryotes are quite different. Plants cell wall made of cellulose, fungi has chitin in its cell wall and prokaryotes has different layers of cell wall.

Thus, the correct answer is option (D).

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