B. is the correct answer. It makes sense too because vaccines are usually inserted in a vein, which is where the bloodstream is. With all of this medicine in your body, the virus will come into the body, the body will recognize what the virus is, sending out the antibodies from the vaccine into the bloodstream and all around, then the virus is dead. :)
It basically allows them to see what time period it is from or from where it is from (they predict from the age). It also allows them to arrange geological events more accurately depending on where the rock was found.
Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
Some scientists hypothesize that the first organic compounds could have been created on Earth by t<span>he mixing of atmospheric gases containing ammonia, hydrogen, water, and methane at high temperatures. C
HOPE THIS HELPS! ^_^</span>
