During the most recent geological era, the _______, certain plants such as legumes formed symbioses with nitrogen-fixing bacteria.
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Q108: 14C decays to 14N with a half-life
Q109: Giant insects have not appeared in the
Q110: Evidence that meteorites collided with Earth at
Q111: The _ period (characterized by the evolution
Q112: At very small population densities, local extinctions
Q114: The current geological period, the Quaternary is
Q115: As a result of continental drift, the
Q116: At the global level, changing environmental conditions
Q117: Plate tectonics have resulted in the merging
Q118: In 2006, paleontologists announced that fossils of
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