Sub-Saharan Africa gets massive amounts of rainfall, and Antarctica supports a pretty surprising diversity of life. You could well have a valid point but your "

Sub-Saharan Africa gets massive amounts of rainfall, and Antarctica supports a pretty surprising diversity of life. You could well have a valid point but your "background points" are totally wrong, you'd be better just omitting them next time. Moving on from that nitpick, have you actually tried to find out why water is considered a significant indicator for life? And is it really the case that other things such as what you've listed are overlooked?