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The long-run total cost of zero output is equal to
Cnidarians
A phylum of aquatic invertebrate animals that includes jellyfish, corals, and sea anemones, characterized by their specialized stinging cells called cnidocytes.
Echinoderms
A phylum of marine animals characterized by radial symmetry, a calcareous skeleton, and a complex water vascular system, including starfish, sea urchins, and sea cucumbers.
Arthropods
Invertebrate animals having an exoskeleton, a segmented body, and paired jointed appendages.
Flatworms
A diverse group of invertebrates belonging to the phylum Platyhelminthes, characterized by their flat, soft bodies.
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