Question

why different organisms have different respiratory systems​

Answer 1

because of their body size and their types

some are unicellular and some are multicellular so according to their body shape and type

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Answer 2

Different organisms have different respiratory systems because it depends on the need and habitat of the particular orgsnism.

Also, they have different respiratory systems because some organisms are unicellular and some are multicellular.

The two types of organisms requires different type of systems.

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