I WILL GIVE 40 POINTS TO WHOEVER ANSWERS CORRECT.!*science* These graphs show a change in four types of greenhouse gases from 1975 to 2015. Based on the results of your experiment, how might these changes in greenhouse gases affect Earth’s temperatures? Which is the only greenhouse gas to show a downward trend in its concentration?

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?