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Humans require organ systems to carry out life processes. Single-celled organisms do not have organ systems and yet they are able to carry out life processes. This is because

User SamPutnam
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Answer:

They contain cell organelles that perform the functions at a cellular level rather than at the systemic level of the human. Most important is the nucleus and the cytoplasm.

Step-by-step explanation:

User Kshitij Marwah
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