Which best describes singing behavior in birds? singing is learned; the species song is innate. singing is innate; the species song is learned. all singing is innate. all songs are learned.

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

When analyzing tree rings, what do scientists assume a thin ring indicates?