3.For years, laboratory rats have been fed W&S animal food. A new type of food, Happy Rat, is now available and claims to be better thanW&S. An experiment is designed to test this claim. Two identical groups of rats are set up. One group is given W&S food and the otheris given Happy Rat food. The type of food given is the ___________variable. Rats are weighed daily to determine if they gain weight. This is the ______________variable. 4.The statement “there is no difference in weight gain between the two groups of rats” is called the ____________________.
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5.When two groups are set up in an experiment, the group that receivesthe independent variable is the ____________and the group without thisvariable is the _______________.6.The independent variable is the only variable that is allowed to be different. All other variables that must remain constant are called the ______________________7.Is each instrument below used to measure length, volume or massa.Triple beam balance__________b.Graduated cylinder___________c. Pipette_____________________d.Metric ruler________________8.In the metric system, the standard unit of mass is the ______________. For volume, it is _______________ and for length, it is ______________________.9.One nanometer is equal to __________meters10.One microliter is equal to ________liters
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