1.The chemical substances that the endocrine glands secrete are called__________.
2. The beginning of menstruation at puberty is called____________.
3. _____________ is known as dual gland.
4. In males, the ___________ increases in size and appears as a protrusion in the throat.
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Answer:1. Hormone
2. Menarch
3. Pancreas
4. Adam's apple
Explanation:
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