Question

eduardo often saw woodpeckers perched in trees in his backyard, but he never saw them at his bird feeders. eduardo 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, eduardo gathered eight identical bird feeders. he filled four with sunflower seeds. he filled the remaining four feeders with crushed peanuts. eduardo 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. complete the sentence. in this experiment, the type of food used in the bird feeders was ________. a dependent variable an independent variable

Explanation:

In an experiment, the independent variable is the factor that is manipulated by the experimenter. Here, Eduardo changed the type of food (sunflower seeds or crushed peanuts) in the bird feeders. The dependent variable would be the number of woodpeckers visiting, as it depends on the food type. So the type of food is the independent variable.

Answer:

an independent variable