public static void garbageDisposal() {
    for (ArrayList orgs : organisms) {
      for (int i = 0; i < orgs.size(); i++) {
        Organism g = (Organism) orgs.get(i);
        if (g.life.isDead()) {
          g.life.kill();
          orgs.remove(g);
          i--;
        }
      }
    }
  }