Keesha did an experiment to study the rate of photosynthesis in the water plant Elodea,. She placed a piece of Elodea in a beaker of water and set the beaker 10cm from a light source. Keesha counted the bubbles released from the plant every minute for five minutes.
What is the outcome variable (dependent variable) in this experiment?
a. the number of bubbles produced
b. the type of plant placed in the beaker
c. the amount of time the bubbles were counted
d. the distance of the light source from the plant
(Please include and explanation.