A particular single-celled organism uses radiant energy to fix carbon as sugars. This organism generates ATP by breaking down sugars through a process that uses oxygen. Based on this information, how should this organism be classified? A. aerobic heterotroph B. aerobic autotroph C. anaerobic heterotroph D. anaerobic autotroph

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.