Biology, 22.01.2020 04:31, soapai

When the human virus hiv first appeared, the mortality rate was close to 100%. however, recent information shows some individuals are unaffected by the virus. why is this not surprising?
a) individuals started to use protective measures more frequently.
b) the virus mutated through natural selection.
c) humans are genetically diverse, and some are immune to the virus.
d) new pharmaceutical medicines were produced that were more effective.

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When the human virus hiv first appeared, the mortality rate was close to 100%. however, recent infor...