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What experiment did Stanley Miller and Harold Urey do that helped provide evidence for the Oparin-Haldane Hypothesis?
How do cnidarian nerve nets differ from nervous system seen in bilaterally symmetrical animals?
How do cnidarians differ from ctenophores? (classes/similarities/differences)
What are the three basic shapes/types of epithelial cells in animals?
What is the function of the chromatophores in cephalopods?