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A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that they are unable to produce viable offspring. What kind of evolutionary barrier
asked
May 11, 2018
Biology
middle-school
1
answer
3
votes
173k
views
Pasta, bread, and breakfast cereal are all types of what energy source?
asked
Jan 18, 2017
Health
high-school
2
answers
0
votes
50.3k
views
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