According to Newton’s first law of motion: A- Once a spacecraft is up to speed no more fuel is required to keep it moving
B- It requires more fuel to go to Mars than to go to Mercury
C- The further a spacecraft gets from the Sun, the more fuel it needs to keep moving
D- To stay in orbit a spacecraft needs a continuous supply of fuel

D - to stay in orbit a spacecraft needs a continuous supply to furl

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.

Everything that you need in a lab is in your lab