Bottlenose Dolphins Breathe Air but Can Sleep in the Ocean

question 25

Multiple Choice

Bottlenose dolphins breathe air but can sleep in the ocean because ________.

• A) they sleep for only 30 minutes at a time, which is the maximum interval they can cease breathing
• B) they fill their swim bladder with air to keep their blowholes above the surface of the water while they sleep
• C) they move to shallow water to sleep, so they do not need to swim to keep their blowholes above the surface of the water
• D) they alternate which half of their brain is asleep and which half is awake

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