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blagie
2 months ago
12

A student is conducting their science experiment on the effect of caffeine on dogs. He has 3 groups of test subjects. The 1st gr

oup of dogs receives plain water. The 2nd group of dogs receives 10 mg of caffeine each, and the 3rd group receives 50 mg of caffeine each. He will measure their activity levels by recording how long each dog runs without stopping, after giving them the pills. What is the independent variable in this experiment?
Biology
1 answer:
garik1379 [2K]2 months ago
5 0

The independent variable in an experiment is the one that is deliberately modified or adjusted in order to observe its effects.

In this case, the varying amounts of caffeine administered to the dogs are the factor that changes—the control group receives no caffeine, the second group gets 10 mg of caffeine, while the third group gets 50 mg of caffeine each.

Thus, the amount of caffeine given to the dogs is the independent variable being altered.

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