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.
1 Most lightning occurs within the cloud or between the cloud and ground. 2  Your chances of being struck by lightning are estimated to be 1 in 600,000 but could be reduced by following safety rules.3  Most lightning deaths and injuries occur when people are caught outdoors. Most lightning occurs within the cloud or between the cloud and ground. 2  Your chances of being struck by lightning are estimated to be 1 in 600,000 but could be reduced by following safety rules.