The body is not designed very cleverly at all. It may look like everything was planned there from the start but in reality it is all held together with ducktape and hope. Some sort of safety stop for your fever for example is not something which have been developed. There may have been some simple mechanisms in place which could have been developed into a working system but more then likely these ended up not letting the body get high enough of a temperature or let the fever get too high anyway and therefore people with those genes died out faster.
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