Death!! Both you and your friend have died because of our experiment. Luckily, the dying does
  not end here, as a result of your deaths more suffering will come!

  ANTHRAX

  How does it destroy, or assist in destroying the body?
  The anthrax spore grows in the body, and bacteria starts to grow. The bacteria releases three 
  proteins, Protective Antigen (PA), Lethal Factor (LF), and Edema Factor (EF).

  Protective Antigen (PA): provides the other proteins a method of entering the healthy cells of the
  body.

  Lethal Factor (LF): disrupts cell activity and kills the cell.

  Edema Factor (EF): stops the flow of ions in the cell, and causes fluid to build up (edema).

  SMALLPOX

  How does it destroy, or assist in destroying the body?
  The smallpox virus is parasitic. The small pox virus functions as a normal virus, it enters the body 
  and utilizes the host's cells to reproduce and through the process the host's cells die, while the virus
  is propagating.

  CONTINUING EFFECTS

  What will happen in real Life?
  If given appropriate weather and wind conditions fifty kilograms of anthrax released from an
  aircraft along a two-kilometre strip could create a lethal cloud twenty kilometres downwind. 
  Almost anyone in the vicinity would be infected.  If a release of aerosolized anthrax upwind
  of a population of five million could lead to an estimated two hundred fifty thousand
  casualties and one hundred thousand of those casualties would die.  If a release of one
  hundred kilograms of aerosolized anthrax was dropped over Washington, D.C, one hundred
  thirty thousand to three million deaths could occur, making it more lethal than a hydrogen
  bomb.

  Environmental Impact
  If ever a deadly biological agent, like anthrax or small pox, was ever found in an environment, and 
  had already contaminated some of the organisms in that environment, then the organisms that feed
  on these organisms would start die as well.  These organisms would die if they consumed an
  organism originally contaminated with anthrax.  However the organism that is one trophic level lower
  then the contaminated organism is, it would increase in its population, since now there are less
  predators/consumers, given that they are all dying.   Thus resulting in a very unbalanced
  environment, all the organisms that are in the higher trophic levels would soon disappear. Therefore
  only the lower trophic level organism can then be found in this once full of life, and various animal
  environment.  The only possible way for these lost organism to return back into the environment
  would be after many decades, where the agent is now gone.  Therefore allowing an existing
  organism in another environment to migrate to this environment.  If these did not happen, the
  environment would continue to contain all the low trophic level organisms, thus creating a simple
  environment.