The cells of these primitive organisms lack organized nuclei and they reproduce asexually.
A) brachiopods
B) trilobites
C) eukaryotes
D) prokaryotes
E) none of the above
Correct Answer:
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Q19: This least understood eon of Earth's history
Q20: The_ period was a time of major
Q21: Due to a virtual absence of land
Q22: The process in which plants use light
Q23: The beginning of the_ era is marked
Q25: _means "planets in the making."
A)Protoplanets
B)Jovian
C)Terrestrial
D)Asteroids
E)none of the
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Q27: As they formed, due to their high
Q28: _Eon accounts for ~90% of the geologic
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