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The theories of Charles Darwin, arguing that species evolve through time, were
Annelids
A phylum of segmented worms that includes earthworms, leeches, and polychaetes, characterized by a segmented body structure.
Flatworms
A group of invertebrates within the phylum Platyhelminthes, known for their flat, soft bodies.
Water-Vascular System
Of echinoderms, a system of fluid-filled tubes and tube feet that function in locomotion.
Echinoderms
A phylum of marine animals characterized by radial symmetry, a calcareous skeleton, and a water vascular system, includes starfish and sea urchins.
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