Assume two habitats have the same number of species. One habitat is predominantly one species with just a few of the other species. The other habitat has equal numbers of all the different species, which will have the highest diversity index?

The habitat with equal numbers of all the different species will have the highest diversity index. This is because diversity index takes into account both the number of species present and their relative abundance. In a habitat with equal numbers of all species, there is a more even distribution of species, leading to a higher diversity index compared to a habitat with one predominant species and just a few of the other species.