Question 1 What substance is secreted by sebaceous glands? Question 2 Name the time period in one's life when the brain has the greatest capacity for learning? Question 3 Name glands present in the skin whose increased activity causes pimples and acne? Question 4 Name male sex organs which develop completely at puberty? Question 5 Name female sex organs which develop … [Read more...] about Changes at puberty:Pimple and acne, development of sex organs