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.
The flash of a nearby lightning bolt followed by the crack of thunder can't help but make you take notice of the power of nature. And it's a good thing you get that reminder because lightning kills more people than floods, hurricanes or tornadoes.