Which statement represents an unsafe procedure for heating a nutrient solution in a flask?

Conclusions based on an experiment are most likely to be accepted when

Which statement best describes a hypothesis?

In an experiment to test the effect of exercise on the number of times a clothespin can be squeezed in 1 minutes, the dependent variable would be the

A science researcher is reviewing another scientist's experiment and conclusion. When would the reviewer most likely consider the experiment invalid?

Which statement best describes a scientific theory?

The development of an experimental research plan should not include a

Researchers performing a well-designed experiment should base their conclusions on

results predicted before performing the experiment

If a control group is not included in an experiment, it would be difficult to

A controlled experiment allows the testing of

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