How are “number of embryonic layers” become a basis of classification? Plz answer this question anyone Thank u ❤️❤️
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All animals develop their tissues, organs, and organ system from the cells that form the embryonic layers. Based on the number of embryonic layers, animals are classified into two- diploblastic and triploblastic animals.
In diploblastic animals, the cells form two embryonic layers, i.e., an outer layer- ectoderm and an inner layer – endoderm, e.g. Phylum Coelenterata.
In triploblastic animals, cells are arranged in three embryonic layers- ectoderm, endoderm and a middle layer – mesoderm. Animals belonging to Phyla Platyhelminthes to Chordata have a triploblastic organization.
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