Surtsey is a volcanic island that was formed off the coast of iceland in the 1960s. After the eruption that created the island, organisms slowly arrived and grew on the island. The first organisms were some bacteria and fungi. Within about two years, the first vascular plants had arrived and by the end of the first decade there were 10 species of vascular plants on the island. Forty years later, there were about 60 species of vascular plants. What is likely true about this situation