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Which stimulus causes a porcupine to extend its quills? lunar effect on Earth seasonal temperature changes threatening behavior by predators environmental encroachment by humans
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Which stimulus causes a porcupine to extend its quills?

lunar effect on Earth
seasonal temperature changes
threatening behavior by predators
environmental encroachment by humans

User Andrew Steitz
by
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1 Answer

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The answer is threatening behavior by predators. Reason is that it is used as a self defense strategy.
User SanSolo
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