There is a huge number (1.5 x 1084) of possible genetic codes. however, the genetic code used by all known forms of life is nearly universal. this suggests that

There is a huge number (1.5 x 1084) of possible genetic codes. However, the genetic code used by all known forms of life is nearly universal. This suggests that life evolved from a single source.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.