Final answer:
In an Arctic ecosystem, future generations of rabbits would be expected to have white fur most often.
Step-by-step explanation:
In an Arctic ecosystem, white fur is a beneficial trait that improves a rabbit's chances of survival by making it harder for predators to spot. Through natural selection, brown fur rabbits will become less common over time. As a result, future generations of rabbits born in the same ecosystem would be expected to have white fur most often.