500
If a small population and a large population are under the same selective pressures and have the same amount of genetic variation, would you expect the large population or the small population to evolve faster?
Small - This one is tricky! Usually, larger populations have more genetic variation (and thus a greater capacity to evolve).
However, if the genetic variation is the same, the smaller population will evolve more quickly.
It's quicker to spread a mutation throughout a smaller population than a larger one.