The phrase “on which continent are there no native cat species” refers to the question of which continent does not have any cat species that are native to it. The answer to this question is Antarctica. Cats are found on all other continents, but they are not native to Antarctica. All cat species on Antarctica have been introduced by humans.

This fact is significant because it highlights the unique environmental conditions of Antarctica. The continent is extremely cold and inhospitable, and it is covered in ice for much of the year. These conditions make it difficult for cats to survive in the wild.