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.
Earth's least dense elements, including __________ and __________, formed the planet's first atmosphere. hydrogen and nitrogen. It is possible that RNA was the first information-storing molecule, but over time, ____ became the primary way in which genetic information is stored and transmitted.