"Nothing in biology makes sense except in the light of evolution." -Theodosius Dobzhansky
Your Inner FishHHMI Documentary (Episode 1)
Your Inner ReptileHHMI Documentary (Episode 2)
Your Inner MonkeyHHMI Documentary (Episode 3)
"Flap to the Future" Game LinkThe above image is an example of analagous structures (similar functions of differently evolved structures) that result due to convergent evolution. Notice in the cross-sections of the eyes the placement of the nerve tissue relative to the retina when comparing vertebrates to cephalopods. This causes a "blind spot" to occur in vertebrates which does not exist in octopuses, squid and their allies.
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