Getting to the Point
نویسنده
چکیده
Life is tough for water fleas. In addition to the usual troubles faced by every organism, Daphnia have to worry about being eaten by many types of predators. To make them less vulnerable, some Daphnia species grow large helmets or protective spines on their heads and tails. But at least one predator, the stickleback, only fancies a Daphnia diet at certain times of year, so it would be inefficient, maybe even paranoid, for a tiny Daphnia to always carry around its cumbersome armor. The solution to this problem is to develop armor only when danger lurks.
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