Biology · Zoology

What is the primary defining characteristic of organisms belonging to the phylum Protozoa?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Respiration occurs via specialized lungs.
2Their protoplasm lacks a well-defined nucleus.
3They are microscopic single-celled organisms.✓
4They are exclusively multicellular organisms.

Correct answer

They are microscopic single-celled organisms.

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What is the primary defining characteristic of organisms belonging to the phylum Protozoa?

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