Question

more experimental design practice
the respiration rate of a goldfish is measured. the goldfish is then placed in cold water and the respiration rate is measured again.
the independent variable is
the dependent variable is

Explanation:

The independent variable is the factor manipulated in an experiment. Here, water temperature is changed (from initial to cold). The dependent variable is the factor measured in response; respiration rate is what’s observed to change with temperature.

Answer:

Independent variable: Water temperature
Dependent variable: Respiration rate of the goldfish