Winter Hibernation and Spring Reproduction in Bears Are Cued by Seasonal

question 8

Multiple Choice

Winter hibernation and spring reproduction in bears are cued by seasonal changes in the secretion of

• A) melatonin from the pineal gland.
• B) melatonin from the hypothalamus.
• C) thyroxine from the anterior pituitary gland.
• D) acetylcholine from the pineal gland.
• E) thyroid-stimulating hormone from the posterior pituitary gland.

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