Why can protozoans get by without a respiratory system?

1 Answer
Meave60
Jun 16, 2017

They don't need a respiratory system. They can undergo gas exchange by diffusion directly from their environment.

Explanation:

Protozoans are unicellular heterotrophic eukaryotes. Because they are unicellular, they can undergo gas exchange by diffusion directly from their environment. Therefore, they don't need a respiratory system.

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