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.
The earth's atmosphere did not contain oxygen when the earth formed 4.6 billion years ago. This reducing environment provided favorable conditions for the natural synthesis of the first organic compounds. The first phospholipid bilayer membranes formed along with primitive RNA and DNA genetic molecules.