During the __________ Eon, there was no free oxygen in the Earth's atmosphere.
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Q5: Organisms that derive food energy by feeding
Q6: _ study the fossilized remains of ancient
Q7: _ cells are generally small and comparatively
Q8: _ cells are generally large and comparatively
Q9: Among the many remarkable aspects of the
Q11: Evolution is achieved through the process of
Q12: An organism's genetic sequence can also change
Q13: The most ancient fossils that have been
Q14: During a relatively short period of Earth
Q15: The _ Period was the first of
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