History of Life_ Word Scramble
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Question | Answer |
A collection of abiotically produced molecules surrounded by a membrane or membrane-like structure. | protobiont |
An RNA molecule that functions as an enzyme, such as an intron that catalyzes its own removal during RNA splicing. | ribozyme |
A method for determining the absolute age of rocks and fossils, based on the half-life of radioactive isotopes. | radiometric dating |
The amount of time it takes for 50% of a sample of a radioactive isotope to decay | half-life |
The division of Earth's history into time periods, grouped into three eons—Archaean, Proterozoic, and Phanerozoic—and further subdivided into eras, periods, and epochs. | geologic record |
A process in which a unicellular organism (the “host”) engulfs another cell, which lives within the host cell and ultimately becomes an organelle in the host cell. See also endosymbiont theory. | endosymbiosis |
The elimination of a large number of species throughout Earth, the result of global environmental changes. | mass extinction |
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