The dependent variable is the heart rate of daphnia, a small crustacean.
WHAT IS INDEPENDENT AND DEPENDENT VARIABLES?
In an experiment, two variables are important. These two variables are the independent variable and dependent variable.
- The independent variable is the variable that the experimenter alters or changes in order to bring about a change.
- On the other hand, the dependent variable is the variable that the experimenter measures or records in response to a change in the independent variable.
- In this question, a student wants to test the effect of different amounts of caffeine on the heart rate of daphnia, a small crustacean. The student will change the amount of caffeine, making it the INDEPENDENT VARIABLE while the heart rate of the small crustacean will be measured, making it the DEPENDENT VARIABLE.
Therefore, the dependent variable is the heart rate of daphnia, a small crustacean.
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