Created by StemPy LabThe embryos of a fish and of a human both show slits on the sides of the neck. Haeckel said that this proves that an embryo repeats the adult stages of its ancestors. What did von Baer find?
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← A wooden bowl from an old site has one thirty-second of the carbon-14 that a living tree has. The half-life of carbon-14 is 5730 years. How old is the bowl?Before industry spread in England, pale peppered moths were more common than dark ones. Around 1920 the dark form was more common. What caused the change? →
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