Final answer:
The island biogeography model explains the factors affecting the number of different species in a region. Larger islands with more resources tend to have more species, while smaller islands with limited resources have fewer species. The distance of an island from the mainland also influences the number of species through colonization rates.
Step-by-step explanation:
The island biogeography model explains the factors affecting the number of different species in a region. According to the model, the number of species on an island is influenced by two main factors: the size of the island and its distance from the mainland. Larger islands tend to have more species because they provide more habitat and resources, while islands closer to the mainland have more species due to higher rates of colonization. On the other hand, smaller islands with limited resources and greater isolation have fewer species. This model helps us understand how geographical features, like islands, shape biodiversity in different regions.