Agreed - Venus is particularly unlikely to have any life because of its temperatures, I wasn't trying to claim otherwise, just choosing a near neighbor for whic

Agreed - Venus is particularly unlikely to have any life because of its temperatures, I wasn't trying to claim otherwise, just choosing a near neighbor for which we haven't ever tried to look at its rocks through a microscope. However, those pictures don't tell us anything about the presence of microscopic life. On Earth at least, only a quite tiny subset of unicellular life-forms leave any trace large enough to be visible at that level of magnification. Even if they are there in quite large quantities. "Teeming" is of course a relative term, but imagine that there were 1000 unicellular organisms similar to an amoeba on every square cm of those pictures. Would you expect to see anything?