MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Embryonic development. Historical artwork of three reptilian embryos of (from left to right) a lizard, a snake and a crocodile. These drawings are from the 1891 book Anthropogenie by Ernst Haeckel. They are anatomically incorrect, as later evidence revealed that their similarities to human embryos were exaggerated to support the biogenetic law, the theory that humans share a common origin with these animals.
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