In which phylum of animals is the organ-level | vedclass

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(B) The levels of organization in the animal kingdom progress from cellular to tissue,organ,and organ system levels.$1$. Porifera exhibit a cellular l

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Platyhelminthes

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(B) The levels of organization in the animal kingdom progress from cellular to tissue,organ,and organ system levels.$1$. Porifera exhibit a cellular level of organization.$2$. Coelenterata (Cnidaria) and Ctenophora exhibit a tissue level of organization.$3$. Platyhelminthes (flatworms) are the first group of animals to exhibit an organ level of organization,where tissues are grouped together to form organs that are specialized for particular functions.Therefore,the correct option is $B$.

In which phylum of animals is the organ-level of organization first observed?

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