6.9 Types of body symmet C. Germ Layers: Diploblastic and triploblastic In case of multicellular animals, germ layers are formed during initial period of their embryonig development and from those germ layers only, different tissues are formed in the body. In case of some animals, only two germ layers [Endoderm & ectoderm) are formed. Ex.: All Cnidarians. In most of all the remaining animals, three germ layers are formed i.e. mesoderm besides endoderm & ectoderm.
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Answer: Layers of Tissues. Most animal species undergo a layering of early tissues during embryonic development. These layers are called germ layers.
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