What are the two reasons the fossil found on vega island is of particular importance to understanding the climate and location of antarctica millions of years ago?

Wegner, a scientist, collected data on rock formations, fossils, and climates to support his hypothesis that originally they were all living in similar climates. Wegener found the same rock formations and fossils in Africa, South America, and Antarctica. Some of the fossils were of species that grew in only one type of climate, yet the fossils were found on continents with differing climates. How could there be fossils of tropical and temperate climate species in Antarctica, a continent that is permanently covered with ice and snow? Not only was this due to the plates of the world shifting and changing the size and shape of landmasses, but also due to the fact that climates were vastly different when they lived which proves that climates are constantly changing.