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AP Biology Homework, help please!!


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AP Biology Homework, help please!!

Postby DearAmsterdam » Sun Aug 22, 2010 11:28 pm

Okay I swear I have read over this 10 times and I am convinced that it's a trick question, please help me!:

An experiment on a species of small freshwater fish recorded their behavioral responses to different temperatures. Ten fish were each tested once, one at a time.

To begin the experiment, a fish was removed from a stock tank (maintained at 22 degrees Celsius) and placed in a temperature-gradient tank. After the fish had spent 30 minutes in the temperature-gradient tank , the section where the fish was located was recorded. Additional observations were recorded every 5 minutes, for a total of 7 observations per fish.

1. Identify TWO variables that were not specifically controlled in the experimental design.
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Postby JackBean » Tue Aug 24, 2010 8:26 am

what about age and sex of the fishes? The oxygen level seems not to be controled as well (and is IMHO important) or basically the composition of the water

Cis or trans? That's what matters.
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Postby Darby » Tue Aug 24, 2010 9:36 pm

Seems like the stock tank water should have been used in both.

We can't tell whether the lighting was controlled, or whether the gradient was tested "backward."

There really isn't a basic control - transfer the fish without the gradient and see if they orient anyway.
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