I guess the answer is that they only have to live for one day. Any creature has evolved to be able to pass on it’s genes to its offspring. A mayfly hatches, mates almost straight away and then lays its eggs. one they are laid – it’s work is pretty much done. In face, so perfectly efficient is this process that the mayfly can’t even eat – it’s mouth parts do not develop properly but then it’s doesn’t need to – it’s already passed on its genes to the next generation. In one way it’s the perfect example of evolution, even if its also really sad…..
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