Apply the law of conservation of mass to explain how mass is conserved when water evaporates

The law of conservation holds that mass can not be destroyed but can only take on different forms. So if 5 g of water becomes a gas it becomes 5 g of water vapor. The mass of the liquid water is simply transferred into the mass of the newly formed water vapor. 

Organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.