Question

filling their bird feeders with sunflower seeds would increase the number of woodpeckers that visited their yards. so, four of the neighbors filled their feeders with sunflower seeds. another four neighbors left their feeders empty. every morning for a month, the neighbors counted the number of woodpeckers they saw in their yards. in this experiment, which were part of an experimental group? the yards with feeders filled with sunflower seeds the yards with empty feeders

Explanation:

The experimental group in a study is the group exposed to the variable being tested. Here, the variable is sunflower seeds in feeders, so this group receives the test condition.

Answer:

the yards with feeders filled with sunflower seeds