Osteoporosis result from which of the followings?

Doctors have not identified a specific cause or result but they think that there are risk factors like:

- advancing age

- family history

-umheathly life style choices

- taking certain medicine

and just in case you did not know what osteoporosis is it is a common disease that weaken the bone and as they weaken you have a higher risk of unexpected fractures

Three reasons of the deaths of native americans: new illnesses that their immune systems couldn't cope with. genocides so the settlers could have the good land.starvation from lack of rations and poor infertile land on resevations