Why do camera lenses breed mold in wet weather? How to store it?

It is easy to grow mold in wet weather, not only in camera lenses, but also in our daily necessities and food. Mold is harmful to our health, so we need to prevent the growth of mold. My personal articles for daily use and the like need to be stored in moistureproof box, which can not only prevent the growth of mold, but also be used as a daily cabinet. Very convenient! !