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 * Jan has made a common mistake in her experiment. It has to do with maintaining all of the constants. It is very important to maintain absolute consistency in all test groups. This is especially difficult when dealing with biological experiments because they typically have MANY constants that have to be monitored. Here is the answer to the Focus Question:**

Jan's experiment is wrong because she changed the water in the tank of tadpoles with 10g of salt in it and she did not change the other tanks at the same time. This gives the 10g tank an unfair advantage over the other tanks because partway through the experiment, they got fresh, clean water. This could affect their development, possibly making them develop faster. Jan would not be able to argue that only the amount of salt in that tank affected their development.