Presence of vertebrae is a shared characteristic among all chordates.
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Q63: The tendency to concentrate sensory organs and
Q65: Figuer: Q66: Mammals that lay eggs are marsupials. Q66: Flatworms have complete digestive tracts. Q67: An animal with an indirect development undergoes Q69: Figuer: Q70: Centipedes,earthworms,and roundworms all illustrate segmentation. Q72: What key research question was addressed by Q73: Flatworms have bilateral symmetry. Q87: An internal membrane in chordates that protects
Main animal groups are noted at the
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