Like the shirt on the NeatoShop said, Biology is the only science where multiplication and division mean the same thing. (So, what sound effect comes to mind as you watch the clip above?)
Animated GIF via nature-gifs and It's Okay to be Smart
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That's probably just a confocal microscope artefact. I don't think it starts that early.
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The one on the left goes from one to two and then four cells. The one on the right goes from four to eight to ... We were taught that the next step was 16, but it appears to be 12. Could bilateral symmetry start that early?
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