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In which phylum do organs and organ systems first appear?
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In which phylum do organs and organ systems first appear?

User RobbeM
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Answer: flatworms

Explanation: Platyhelminthes, flatworms. this tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers.

User Joseph Vargas
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Answer:

Platyhelminthes

Step-by-step explanation:

Platyhelminthes, flatworms. this tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers.

User TWiStErRob
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