Answer:
Bad sanitation makes one susceptible to diseases, and hunger and lack of clean water makes one even more vulnerable to diseases.
Explanation:
It also can be due to depression. people ends up having a hard time and they just don't know what else to do. they end up taking the wrong path and try to hide this pain
Our lung capacity naturally starts to decrease at the age of 30. By the time we reach 50, it could be decreased by half. I'm not sure about when we reach 90 though. Hope this helps! :)