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octopus cephalopod mollusc invertebrate animal underwater ocean sea creature nature wildlife biology marine tentacles suction cups arms head eyes beak mouth food predator prey camouflage adaptation evolution intelligence learning memory problem-solving communication behavior habitat distribution population conservation threats fishing overfishing climate change pollution disease parasites predators prey competitors symbiosis mutualism commensalism parasitism ecosystem food chain trophic level biodiversity conservation ecology environment science nature wildlife biology marine underwater ocean sea animal invertebrate mollusc cephalopod octopus tentacles suction cups arms head eyes beak mouth food predator prey camouflage adaptation evolution intelligence learning memory problem-solving communication behavior habitat distribution population conservation threats fishing overfishing climate change pollution disease parasites predators prey competitors symbiosis mutualism commensalism parasitism ecosystem food chain trophic level biodiversity conservation ecology environment science