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Geochemical evidence indicates that about ______ years ago an abrupt planet-wide warming happened. 80 million 1.2 billion 55 million 56,000
asked
Apr 27, 2017
Biology
high-school
2
answers
5
votes
10.2k
views
Which is not under the direct control of human manipulation? A. natural selection B. DNA engineering C. genetic engineering D. selective breeding
asked
Mar 25, 2017
Biology
middle-school
1
answer
3
votes
33.9k
views
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