The first phylum of animals to exhibit triplo | vedclass

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(B) Triploblastic animals are those that possess three germ layers: ectoderm,mesoderm,and endoderm during embryonic development.$1$. Porifera and Cnid

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Platyhelminthes

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(B) Triploblastic animals are those that possess three germ layers: ectoderm,mesoderm,and endoderm during embryonic development.$1$. Porifera and Cnidaria are diploblastic,meaning they have only two germ layers (ectoderm and endoderm).$2$. Platyhelminthes (flatworms) are the first group of animals in the evolutionary sequence to develop a third germ layer,the mesoderm,between the ectoderm and endoderm.$3$. Therefore,Platyhelminthes is the first phylum to exhibit triploblastic organization.

The first phylum of animals to exhibit triploblastic organization is:

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