Question

why did protozoa appear first ?
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Answer 1

Answer:

Protozoa are single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris. They first appeared in water.

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Answer 2

Answer:

Protozoa are single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris. They first appeared in water. They are motile, nearly all possess flagella, cilia, or pseudopodia that allow them to navigate their aqueous habitats.

Explanation:

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