Asked by john

Making a vaccine for HIV is difficult because the virus has a rapid rate of (A)__________. This is because it is a(n) (B)________ - its genetic material is RNA instead of DNA.
Answered by Writeacher
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Answered by Damon
mutation

see:
https://answers.yahoo.com/question/index?qid=20120409133046AADHBVS
Answered by Rebecca
mutation, retrovirus
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