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Sometimes there is only one lightning stroke,but more often the leader-and-stroke process is repeated in the same ionized channel at intervals of about four-hundredths of a second.The subsequent leader,called a ____________________ proceeds from the cloud along the same channel as the original stepped leader;however,it proceeds downward more quickly because the electrical resistance of the path is now lower.
Paraphyletic
A term used in phylogenetics to describe a group of organisms that includes an ancestor but not all of its descendants, contrasting with a monophyletic group.
Polyphyletic
A group of organisms derived from more than one common evolutionary ancestor or ancestral group, indicating they do not share a common lineage.
Phylogenetic Trees
Diagrams that represent the evolutionary relationships among various biological species or other entities, based upon similarities and differences in their physical or genetic characteristics.
Systematists
Systematists are scientists who study the classification and evolutionary relationships among organisms, organizing them into systems of taxonomy.
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