Question

Investigation of robins: A student notices robins in her yard during the winter. If she thinks that some robins must migrate in the winter, she counts the robins in her yard once a week for two years. She finds that there are about half as many robins in her yard in the winter as in the summer. Her research has shown that some robins are not in her hypothesis.

Answer 1

To collect data to test the hypothesis that birds of various species recognize the predator warning calls of other bird species, the biologist can observe the behavior of the birds at the feeders in the forest and record any instances where they respond to predator warning calls made by other species.

Step-by-step explanation:

In order to test the hypothesis that birds of various species recognize the predator warning calls of other bird species, the biologist can use the established feeders in the forest to collect data. The biologist can observe the behavior of the birds at the feeders and record any instances where they respond to predator warning calls made by other species. By analyzing the data collected from the feeders, the biologist can determine whether the birds are indeed recognizing and responding to the predator warning calls of other bird species, thus testing the hypothesis.