# 3 for years laboratory rats have been fed ws animal

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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 than W&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 other is 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 receives the independent variable is the ____________and the group without this variable 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 mass a. 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 __________meters 10. One microliter is equal to ________liters
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