Question

11. The physical, mental, intellectual and emotional changes which occur at
adolescence are controlled by hormones. Hormones are chemical substances which -
coordinate the activities of living organisms and their growth.​

Answer 1

Answer:

The changes which occur at adolescence are controlled by hormones. Hormones are chemical substances. These are secretions from endocrine glands, or endocrine system. The male hormone or testosterone begins to be released by the testes at the onset of puberty.