It all depends on the species, some lose all of their leaves for part of the year while others lose their leaves before the next growing season, retaining some during winter or dry periods.
Water Vapor,Ozone ,Hydrofluorocarbons
I would say that would be DNA
Hope this helps :)
The leading cause of memory loss between the ages of 15 and 25 is traumatic brain injury.
hope that helps, God bless!