Platyheminthes are the first group of animals which are, and show grade of organisation.

diploblastic

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triploblastic

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organ system

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cellular

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Solution

The correct option is C organ system
Platyhelminthes are commonly called flatworms. These are the first group of animals which are triploblastic. They consists of all the three layers, ectoderm, endoderm and mesoderm. They show organ system grade of organisation.

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