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What would happen if photosynthesis on Earth stopped?
answered Nov 4, 2017
4 votes
27.9k views
Based on the nebular theory as it explains our own solar system, which of the following should we expect to be true for other star systems?
answered May 15, 2017
2 votes
18.9k views
Who challenged President Carter for the Democratic nomination in the 1980 primaries?
answered Jan 14, 2017
0 votes
55.8k views
in sunlight, a vertical stick has a height of 4 ft and casts a shadow 2 ft long at the same time that a nearby tree casts a shadow 18 ft long. how tall is the tree
answered May 19, 2016
4 votes
164k views
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