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DavidMcC's Avatar Jump to comment 20 by DavidMcC

Comment 19 by Jussie

A lot of life on earth consists of bacteria in the earths crust...

Maybe, but for surface life, eyes are a "must have", unless you live in a very dark cave. This is because imaging eyes can evolve if there is light to see, so inevitably, they do evolve, sooner or later - usually sooner, once you have multicellularity. (Even one single-celled species has organelles that appear to produce some sort of vision, AFAIK.)

Mon, 03 Oct 2011 11:26:13 UTC | #877346