(worth 20 points) which of the following explains why it is not easy to tell the directions of movement of pressure centers and fronts from a surface map alone? a. you must know the location of major land masses such as mountains. b. you must know the density and steepness of an approaching front. c. you must know the variations in temperature. d. you must know the pressure changes and the patterns of circulation of the upper air.

The answer is D you must know the pressure changes and the patterns of circulation of the upper air

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.