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Unformatted text preview: The First Eukaryotes-Oldest fossils of eukaryotic cells are 2.1 BY old-Endosymbiotic Theory-Mitochondria & plastids were formerly small prokaryotes living within larger host cells- Were possibly undigested prey or internal parasites or mutualists Clock Analogy-Shows time scales involved in the history of life on Earth Phylogeny and the Tree of Life Chapter 26 Phylogeny: the evolutionary history of a species or group of related species Systematics: an analytical approach to understanding the diversity and relationships of organisms Concept 26.1: Phylogenies show evolutionary relationships-Taxonomy: the ordered division of organisms into categories based on a set of characteristics used to assess similarities and differences...
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- Spring '08