The __________ Period was the first of the six periods in the Paleozoic Era.
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Q10: During the _ Eon, there was no
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
Q16: The earliest plants, of which mosses and
Q17: Despite their limitations, the _ ruled the
Q18: _ is the permanent disappearance of a
Q19: Analysis of the fossil record shows evidence
Q20: The extinction of the dinosaurs occurred about
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