From similarity and differences of morphological, biochemical, cellular characteristics, biologist have constructed 'phylogenetic (evolutionary) trees' (who is most closely related to who, analogous to a family tree)
In the United States, lightning routinely kills more people each year than tornadoes or hurricanes. Tornadoes, hail, and wind gusts get the most attention, but only lightning can strike outside the storm itself. Lightning is the first thunderstorm hazard to arrive and the last to leave.
In developed countries, lightning causes death in about 10% of its victims. The ratio of deaths to injuries in developing countries is unknown. After a lightning injury, the probability of death is unrelated to sex, age, and the presence of trunk and arm burns.