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.
Simply put, a person can be killed or seriously injured if lightning strikes them or an object in close contact to them. Even people indoors have been killed by lightning travelling through wires and pipes. An average of 10 people in Florida are killed by lightning strikes annually and 40 are seriously injured.