Cellular grade of organisation is found in :- | vedclass

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(A) In the animal kingdom,the level of organization refers to the complexity of the body structure.$1$. Cellular level of organization: This is the si

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Sponges

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(A) In the animal kingdom,the level of organization refers to the complexity of the body structure.$1$. Cellular level of organization: This is the simplest level where cells are arranged as loose cell aggregates,but they do not form tissues. This is characteristic of the phylum $Porifera$ (sponges).$2$. Tissue level of organization: Cells performing the same function are arranged into tissues,as seen in $Coelenterata$ and $Ctenophora$.$3$. Organ level of organization: Tissues are grouped together to form organs,specialized for particular functions,as seen in $Platyhelminthes$.$4$. Organ system level of organization: Organs are associated to form functional systems,as seen in higher phyla starting from $Aschelminthes$ to $Chordata$.Therefore,the cellular grade of organization is found in sponges.

Cellular grade of organisation is found in $:-$

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