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Scullion Scullion
wrote...
Posts: 1378
Rep: 4 0
7 years ago
A sample of fish is taken from a lake to measure the effect of pollution from a nearby factory on the fish.
A) Observational
B) Experimental
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JoannaMillsJoannaMills
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Posts: 478
7 years ago
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Scullion Author
wrote...
7 years ago
My exam is literally tomorrow!

thanks
wrote...
7 years ago
Good luck on your exam!
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