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.
Conditions for synthesis of organic molecules on the early Earth are reviewed, and gene-first and metabolism-first models are discussed. While the origin of the homochirality of amino acids and sugars has been a puzzling problem for decades, recent findings provide plausible explanations.