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Using the visual you provided, the correct sequence is:
Sequence one: The double-stranded DNA virus then enters the nucleus and integrates itself into the host's DNA.
Sequence two: after the retrovirus entered, the enzyme reverse transcriptase uses the RNA as atemplate to make a double-stranded viral DNA module.
Sequence three: The cell then makes new viral RNA and proteins, which can leave the host cell and infect other cells.
*Notice that in the first sequence, the word virus was added.
