a student performed an experiment to see if water temperature affects the level of activity in aquatic snails. the student set up four tanks with five snails in each tank. all four of the setups were identical in every way, except for the temperature of the water. in order to make the conclusions more valid, the student could

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the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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