Answer: yes it is really dangerous to drink blood of different blood type. It is fatal.Incompatible blood causes reactions and that reactions forms blood clotts and it blocks the airways , veins and arteries. It also causes blood destruction that may lead to bleeding, dyspnea, and changes in vital signs. A fever is a preliminary change or a shock that cause death will occur. Seizure, difficulty of breathing, allergy and other irregularities will surely observed to the patient.Drinking blood is not the same as getting blood from an IV infusion. Blood that is drunk follows the same route as all food and drink - into your stomach where it is digested.
Answer: Anything that is added to an environment that does not belong is considered pollution. Smoke from vehicles and factories cause air pollution. Sewers, litter, bilge from ships cause water pollution. Sound caused by vehicles, factories, machines, etc, cause noise pollution.
Answer: That depends on your point of view and what body part your focusing on. For the Central Nervous system the most dangerous drug would probably be barbiturates. Crack Cocaine is also very dangerous, as are Hallucinogens (LSD, PCP, Magic Mushrooms) Amphetamines are also very dangerous. Whether they are legal amphetamines (adderall) or illegal amphetamines (methamphetamine.)
Answer: Alcohol and benzodiazepine withdrawal are, by far, the most dangerous. Both of these substances bind GABA (gamma-amino-butyric acid), the major inhibitory neurotransmitter in the central nervous system. When GABA receives no more "stimulation" from alcohol or benzodiazepines (e.g. Xanax, Valium, Ativan, Klonopin, etc.) there is a significant imbalance between excitatory and inhibitory neurotransmission. Excitation of the neuronal system prevails, and withdrawal symptoms of hypertension, tachycardia, sweating, tremors and anxiety occur, and may be followed by seizures, and even coma and death, if left untreated.