define notochord ?????????????
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a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
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Flatworm Adaptations
They have the following adaptations: Flatworms have three embryonic cell layers. They have a mesoderm layer in addition to ectoderm and endoderm layers. The mesoderm layer allows flatworms to develop muscle tissues so they can move easily over solid surfaces.
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