The most ancient fossils that have been found so far are __________ years old.
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Q8: _ cells are generally large and comparatively
Q9: Among the many remarkable aspects of the
Q10: During the _ Eon, there was no
Q11: Evolution is achieved through the process of
Q12: An organism's genetic sequence can also change
Q14: During a relatively short period of Earth
Q15: The _ Period was the first of
Q16: The earliest plants, of which mosses and
Q17: Despite their limitations, the _ ruled the
Q18: _ is the permanent disappearance of a
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