Answer:
rock layers becuase fossils and other ancient things could be in there
HIV is a retrovirus which contains RNA as its genetic material. Once HIV enters the body, it attaches to T cells that help other lymphocytes respond to infection. Gradually, HIV kills off most of the helper T cells. The RNA is inside the capsule of the virus and is labeled A.
<span>Distance has a huge influence on a planet's average surface temperature. So the answer is A. </span><span>Planet B is expected to be cooler than Planet A.</span>
Hydrogen bonds i hope that helps
