Which phylum of animals lacks organ systems?

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(B) The organization of animals can be categorized into cellular,tissue,organ,and organ-system levels. $1$. Porifera exhibits a cellular level of orga

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Platyhelminthes

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(B) The organization of animals can be categorized into cellular,tissue,organ,and organ-system levels. $1$. Porifera exhibits a cellular level of organization. $2$. Cnidaria and Ctenophora exhibit a tissue level of organization. $3$. Platyhelminthes (flatworms) are the first phylum to exhibit an organ-level of organization,but they lack a complete organ system (e.g.,they lack a complete digestive tract). $4$. Phyla from Aschelminthes to Chordata exhibit an organ-system level of organization. Therefore,among the given options,Platyhelminthes is the phylum that does not possess a complete organ system.

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