rickets occurs when the body has a severe lack of vitamin d during the developmental years vitamin d is essential to the development of strong healthy bones
A clothes dryer should last an average of 10 to 15 years, according to consumer products experts.
1 Central air conditioners -- Typically, a central air conditioning system should last from 10 to 15 years with regular maintenance.  Dehumidifiers -- If you're using a dehumidifier to remove moisture from your basement, expect it to operate for about eight years before it's time to shop for a new unit.