e should have a bath at least once every day. It is necessary for teenagers because the increased activity of sweat glands makes the body smelly. All parts of the body should be WASHED and CLEANED everyday. If cleanliness is not maintained there are chances of catching bacterial infection. Girls should take special care of cleanliness during the time of menstrual flow. They should KEEP track of their menstrual cycle and be prepared for the onset of menstruation.because of the presence of adam's apple in the trachea.HIV is a virus that targets and alters the immune system, increasing the risk and impact of other infections and diseases. Without treatment, the infection might progress to an advanced disease stage called AIDS. Abnormal enlargement of the butterfly-shaped gland below the Adam's apple (thyroid).A goitre commonly develops as a result of iodine deficiency or inflammation of the thyroid gland.The changes occur in the stage of adolescents because of the secrection of hormones in our body.Hormones control the changes that occur at adolescence. The male hormone called testosterone is secreted by the testes at the onset of puberty and cause development of FACIAL hair, chest hair etc. At the onset of puberty in girls, ovaries secrete female hormone or estrogen which makes the breast develop.hope this helps you and plzzz mark brainliest