I believe the answer would be "The animals on the Galápagos Islands were recognizable as similar to their counterparts in other regions of the world, but had a range of noticeable differences from those counterparts. Many animals had small variations from island to island."
pole star is a visible star, preferably a prominent one, that is approximately aligned with the Earth's axis of rotation; that is, a star whose apparent position is close to one of the celestial poles, and which lies approximately directly overhead when viewed from the Earth's North Pole or South Pole.
I can answer the first one, being options 2 and 5. The second question I am not sure about. I would think option 1, since there are less species and organisms on the island, so there might be less biodiversity.
High Density because you are talking about storms and other stuff.