Endocrine glands of body are called __________ glands.


ductless

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Chemical substances secreted by glands are called __________ .


hormones

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Ovaries secrete __________ hormones.


estrogen

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Onset of sexual maturity is called __________ .


puberty

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Puberty begins at age of __________ and lasts till __________ years.


13 years

,

18–19 years

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