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Tripoblastic animals have three germ layers

ectoderm

endoderm

mesoderm

ectoderm- forms the brain and nervous system, epidermis and associated structures (skin, hair, nails)

endoderm- forms embryonic gut, inner lining of the digestive tract, inner lining of the respiratory tract and glands including the liver and pancreas

mesoderm- forms the notochord, and somites which includes muscle, outer covering of internal organs, excretory system and gonands, as well as mesenchyme (loose migratory cells) like the dermis (inner skin layer) the circulatory system (heart and blood vessels) and bones and cartilage

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