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Sea squirts, or ascidians, are a diverse class of marine invertebrates representing...
Of all of the species Haeckel described, he is most famous for his illustrations of...
Copepods are aquatic crustaceans found in every marine habitat, from surface waters...
Sea anemones are members of the phylum Cnidaria, and as such are related to corals...
Starfish—marine invertebrates of the phylum Echinodermata—are famous for their...