When you carry an object while walking at constant speed in a straight line, you exert an upward force on the object. Why are you not doing any work on the object? Please help.

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.

Advection fog occurs when warm air blows over a cold surface like snow and since tropical water is warm advection fog rarely forms over it