Ch 52: ecology and the distribution of life. Air rises when it is heated diff in air temp largely determined by solar energy input rate at which solar energy arrives on earth per unit of earth"s surface depends on angle of. 52. 2 found over long term [weather: short-term state of conditions] o sunlight o o over year more seasonal variation in temp o by sun, so warm air rises in tropics, which receive greatest solar energy input. Rising air is replaced by air that flows in toward equator from n +s o o o latitudes after having travelled away from equator in atmosphere o moisture ex. Nh: has evergreen coniferous gymnosperms; sh: southern beeches. Wallace: correctly deduced that dramatic differences in flora+fauna were related to depth of. Wallace"s line: line he drew through malay archipelago flora, fauna, and microorganisms (the biota) of world allow us to divide earth into biotas of major biogeographic regions are very different from eachother.