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Is a biased sample (always, sometimes, or never true) valid and why?

asked Nov 19, 2016

Mathematics
middle-school

1 answer

1 vote

46.8k views

Which gases enters ocean water from organisms that photosynthesize? A. carbon B. nitrogen C. hydrogen D. oxygen

asked Jan 19, 2015

Chemistry
high-school

1 answer

5 votes

16.0k views

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