Teens & Depression. â 1 Depression is a serious problem today and one of the nationâs leading killers of teenaged boys when the number of cases of suicide it generates are factored into the equation.
The first organic molecules were probably very simple carbon-based molecules made of few atoms. These molecules then combined with other simple molecules to form more complex molecules. Over many years and probably trillions and trillions of chemical reactions, more complex molecules, and more stable molecules, formed.
There are three sources of organic molecules on the early Earth: 1  organic synthesis by energy sources (such as ultraviolet light or electrical discharges). 2  delivery by extraterrestrial objects such as carbonaceous meteorites (chondrites); 3  organic synthesis driven by impact shocks.