Examlex
Compare and contrast serfdom and slavery.
Hypothesis
A suggested explanation for an observed event, intended as an initial point for more detailed research.
Earth's History
A chronological description of the physical and biological events that have occurred on Earth from its formation to the present.
Precambrian
A very long interval of geologic time, from the formation of the solid earth to the beginning of the Paleozoic; it is equivalent to 90% of geologic time.
Precambrian
Referring to the eon that constitutes the earliest part of Earth's history, which ended approximately 542 million years ago.
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