Earth Science - Lesson 6: Geological time (unit 2)
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eukaryotic
a cell that has complex internal structures, such as a nucleus; e.g., plant and animal cells
prokaryotic
a simple cell that lacks complex internal structures, e.g., bacterial cells
stromatolites
fossil mounds made of ancient photosynthetic bacteria
eon
longest interval of geologic time
era
major divisions of geologic time within each eon; identified by major changes in the fossil record
period
major divisions of geologic time within each era; identified by changes in the fossil record