What does Ectotherm mean?
Also known as cold-blooded, these animals need an external heat source such as sunlight, warmer water, or a heat source to regulate their body temperature. Most sharks are ectothermic.

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What does Ectotherm mean?
Also known as cold-blooded, these animals need an external heat source such as sunlight, warmer water, or a heat source to regulate their body temperature. Most sharks are ectothermic.
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