The extinction of the dinosaurs occurred about __________ years ago.
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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
Q19: Analysis of the fossil record shows evidence
Q21: Metabolism is the set of chemical reactions
Q22: In a multi-cell organism, reproduction occurs by
Q23: Polymerization absorbs energy; therefore, growth in living
Q24: Living organisms do not have the potential
Q25: A cell is a complex grouping of
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