Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate. Consider the three primary sources of genetic variation. 1. mutations
2. gene flow
3. sexual reproduction
Review the diagram involving meiosis and fertilization. In all three scenarios, other than the principles governing meiosis, what is the source of genetic variation?
A) mutation
B) gene flow
C) nondisjunction
D) random assortment

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

What is the following best defines climate?

When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?