A drought will occur in the area where the birds that mentioned in the previous questions live. Below you will see the graph of how this drought is predicted to change the availability of food in the area. How do you predict this will affect the variations that we see in the beaks of the bird population overtime? How do adaptations and natural selection explain the changes?

answer; polycythemia is the correct answer;

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.