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Is this true or false: trilobites are common fossils, related to the same group as today's dolphins, whales, and seals.
answered
Nov 29, 2017
Biology
middle-school
6
votes
212k
views
Which was a major cause of environmental pollution in American cities during the late 1800s? . . . . . . . . . A. . large numbers of horses used for transportation . . . . . . . . B. . chemicals used in
answered
Oct 14, 2017
History
high-school
2
votes
51.6k
views
What is a number between 50 and 60. And one of its factors is 28.
answered
Jan 16, 2016
Mathematics
middle-school
6
votes
82.8k
views
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