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ppk ppk
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12 years ago
Contrast the Oort cloud and the Kuiper belt as possible origins for comets. 
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how_mendelhow_mendel
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12 years ago
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Biology!

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ppk Author
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12 years ago
Good timing, thanks!
hpascoe
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Yesterday
Thanks for your help!!
apelton
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2 hours ago
Smart ... Thanks!
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