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Organisms in this kingdom are all multicellular, have cells without cell walls and are all heterotrophic
Geologic time period when most invertebrate animal phyla appeared on Earth; occurred approximately 540 million years ago
Phylum that includes seastars, brittle stars, sea cucumbers, sea urchins, and feather stars
The second stage in embryonic development in which the ectoderm, endoderm, and blastopore are established either by folding in of the blastula
Animal whose blastopore becomes the anis during development (includes echinoderms and chordates)
Members of this animal phylum have segmented bodies, a chitinous exoskeleton, and jointed appendages
Members of this animal phylum all possess a notochord, a dorsal nerve cord and pharyngeal gills slits at some point during their development
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