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The Tse-Tse fly acts as a carrier for sleeping sickness and spreads Trypanosoma gambiense through its bite.

1. Classified under Zooflagellates of Protozoan Protista, they possess flagella and exhibit a heterotrophic (parasitic) way of obtaining nutrition.
2. The stage of Plasmodium that infects humans by entering the bloodstream is the sporozoite.
3. Trypanosoma, Noctiluca, Monocystis, and Giardia are single-celled protists, meaning they are unicellular eukaryotic organisms.
4. Yeast is a single-celled sac fungus that does not have a filamentous or hyphal structure.

Correct answer: Classified under Zooflagellates of Protozoan Protista, they possess flagella and exhibit a heterotrophic (parasitic) way of obtaining nutrition.

Solution

Option A correctly describes Trypanosoma gambiense as a zooflagellate protozoan with flagella and a parasitic mode of nutrition, which is transmitted by the Tse-Tse fly.

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