Pull Of Gravity , that is why you have weight or else without gravitational pull you only have mass hence the equation w = mg
C precipitation because if you look at the diagram, you will see it is raining on the mountains.
It’s Wolf biologists are a specific type of wildlife biologist - a scientist employed to observe and study animal behaviors. In this case, their research and study are limited to wolves. They spend time in the field observing the wildlife and their interactions with each other, prey animals and the ecology.