Which factor contributes to the development of osteoporosis? genetics
lack of calcium
naturally occurring exposure
ingestion of gluten products

As a teen your period can fluctuate but if it seems to unusual to you it’s best just to ask your doctor, it’s probably not something serious

That isn't a question

Cardiorespiratory fitness is vital to lifetime fitness as it has the ability to deliver proper nutrients like oxygen to the different organs of the body and it also removing waste products every prolong physical exercise. a happy heart also does reduces the risk of many diseases which is the answer.

Ask the teacher they will you