The phylogenetic analysis of nucleotide sequences for a group of retroviruses has allowed researchers to discover that there are _____ major types of HIV that originate from one ancestral lentivirus.
A) one
B) two
C) four
D) ten
E) fourteen

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The Answer of The phylogenetic analysis of nucleotide sequences for a group of retroviruses has allowed researchers to discover that there are _____ major types of HIV that originate from one ancestral lentivirus.
A) one
B) two
C) four
D) ten
E) fourteen

The Phylogenetic Analysis of Nucleotide Sequences for a Group of Retroviruses