Answer:
with backbone: notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail
without: Sponges, corals, worms, insects, spiders and crabs
Explanation:
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Answer:
with backbone: notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail
without: Sponges, corals, worms, insects, spiders and crabs
Explanation: