Question

Which is the breathing organ in unicellular organisms?

Answer 1

Answer:

Unicellular organisms do not have any respiratory organs. The mechanism of 'breathing' in unicellular organisms is different from multicellular organisms. Unicellular organisms respire within their cell.

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Answer 2

Answer:

Unicellular organisms do not breathe in the typical sense, but they respirate by allowing oxygen to enter the cell membrane through the process of diffusion. Because they are so small, they do not have the organs, pores and entryways to breathe like multicellular organisms.