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Without a
in an experiment, you can't be sure that the behavior you are interested in would not have occurred anyway without manipulation

If gloves become heavily soiled and additional patient care tasks must be performed on that patient, what should you do? a. no action is necessary as it's the same patient b. change gloves c. double glove d. wash the gloves

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided

When were the first laws enacted in the united states to protect farm animal from cruel treatment? select one or more: a. 1480 b. 1792 c. 1828 d. 1886