How many germ layers do porifera have and name them?
Planaria have 3 germ layers (ectoderm, mesoderm, and endoderm)
Answered -
About Ectoderm
the ectoderm is the outer layer of the early embryo, it is the the first to emerge and forms the outer layer of germ cells. The ectoderm differentiates to form the nervous system, tooth enamel and the epidermis. It also forms the lining of the mouth anus, nostrils, sweat glands, hair and nails.
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