Because of their high rate of mutation. They also can be hard to track because they infuse their DNA into your body cell DNA and can lay dormant and undetected for years.
The two are blood and lymph
Answer:
The free energy released by ATP hydrolysis that may be coupled to an endergonic process via the formation of a phosphorylated intermediate.
<em>Hope this helps</em>
<em>-Amelia The Unknown</em>
