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Mathematics, 01.08.2019 03:00 hgghukghj1814
Some species of hummingbirds appear to hover in mid-air by flapping their tiny wings 80 times per second. how many times per minute do hummingbirds flap their wings?
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Some species of hummingbirds appear to hover in mid-air by flapping their tiny wings 80 times per se...
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