EXPERT ONLY HELP I'LL GIVE BRAINLIEST: EXPLAIN THE ANSWER IN YOUR OWN WORDS.

Answer:
Viruses needs to inject the virus to an organism's body, or host cell and duplicate as many viruses, so it can be able to insert it's own clones and take over the body sooner :3
Explanation:
:3
Answer:
The virus integrates the normal gene into the DNA of the human cell.