Question

the passage below describes an experiment. read the passage and think about the variables that are described. bert often saw woodpeckers perched in trees in his backyard, but he never saw them at his bird feeders. bert usually filled his feeders with sunflower seeds. he wondered if he could attract woodpeckers by adding a different type of food to the feeders. to test this idea, bert gathered eight identical bird feeders. he filled four with sunflower seeds. he filled the remaining four feeders with crushed peanuts. bert then placed the bird feeders in his backyard. over the next five days, he counted the number of woodpeckers that visited each bird feeder each morning. which of the following was a dependent variable in this experiment? hint: an independent variable is a variable whose effect you are investigating. a dependent variable is a variable that you measure. the number of woodpeckers that visited the bird feeders the type of food used in the bird feeders

Explanation:

The independent variable is the type of food (sun - flower seeds or crushed peanuts) that Bert changes to see its effect. The dependent variable is what he measures as a result of changing the independent variable. He measures the number of woodpeckers that visit the bird feeders.

Answer:

the number of woodpeckers that visited the bird feeders