Question

This lab activity is designed to explore the effect of two substances on the heart rate of a Daphnia magna specimen. One of the activities in this lab is to measure the heart rate when the Daphnia is exposed to alcohol. In the experimental setup, what would be the independent variable?

Answer 1

Answer is given below

Step-by-step explanation:

• Heart rate was studied in this experiment and is the dependent variable studied or measured. This is a dependent variable.
• An independent variable is a variable whose modulation is not affected by any other variable in the experiment. Here is the alcohol independent variable.
• Other substances such as intelligence are also independent variables.