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Originally Posted by metaphor-  but didnt we evolve from creatures who came from water? where did our gills go and why didnt we keep them? And where are the missing links of evolution? the solid evidence to support it? |
Believe it or not, fetuses have a stage of developmemt where they show gill-like slits, tails, and other artifacts. It's like the millions of years of evolution replays within 9 months. Pretty strange stuff if you look at the pictures.
In general though, an organ that's not used will slowly become a non-functioning organ (there's nothing to select for working ones), and eventaully not even present itself in the species. For example, a fish that lives in total darkness often has little eyes, but is blind.