Answer: A half-shaded circle represents that a person is a carrier of the trait.
This is called the pulmonary circulation. From your pulmonic valve, blood travels to the pulmonary arteries and eventually to tiny capillary vessels in the lungs.
The beginning of spring in the Northern Hemisphere is marked by the Vernal (spring) equinox. I hope this helps!
Destructive interference is the answer hope this helps (:
The answer would be b, emigration because emigration means to leave an area to go to another one, and all those factors would result in the animals leaving.