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The sea anemone Bunodosoma cavernata survives anoxic conditions for as long as 6 weeks. Whether or not oxygen is present, its neuromuscular responses are the same and the pulses of its nerve net have the same threshold size and shape. Bunodosoma cavernata buried in the sand during a low tide are exposed to anoxic conditions. Their neuromuscular responses in anaerobic conditions ensure protective withdrawal behavior should the need arise.
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Dorothea C. Mangum (1980) studied this question.
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