Question

as part of a study on factors that influence respiration rate, a scientist sets up an experiment to see whether external water temperature is related to respiration rate in fish. she performs the test on 10 goldfish at four temperatures. the scientist counts the number of gill movements for each fish at each temperature for 1 minute. afterward, she averages the data for each temperature. the bar - graph shows the mean number of gill movements at each temperature. which is the independent variable and which is the dependent variable in this experiment? a. the independent variable is the respiration rate; the dependent variable is the temperature. b. the independent variable is the temperature; the dependent variable is the respiration rate.

Explanation:

En un experimento, la variable independiente es aquella que el investigador manipula o cambia, y la variable dependiente es aquella que se mide y que puede verse afectada por la variable independiente. En este caso, el científico está cambiando la temperatura del agua (variable independiente) y midiendo la tasa de respiración (medida indirecta a través del número de movimientos de las branquias, variable dependiente).

Answer:

A. La variable independiente es la temperatura; la variable dependiente es la tasa de respiración.