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in which phylum do organs and organ systems first appear?

Sagot :

Answer:

Platyhelminthes

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.

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.