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| Folding of embryo into layers |
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| covers the surface and becomes the outer covering and in some phyla the central nervous system |
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| the innermost germ layer that lines the digestive tract and organs such as the lungs and liver in vertebrates |
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the third layer (between the other two) forming muscles and most other organs
•Not all animals have mesoderm |
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| fluid or air filled space separating digestive tract from outer body wall |
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| Animals with a true coelom are... |
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| If the coelom is formed from both endo - and mesoderm tissue the animal is a... |
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| If a triploblast lacks a body cavity it is an... |
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