You are surveying biodiversity on a new island chain. You have counted the number of bat species on one island already. The next island is smaller and farther from the mainland than the one you have just surveyed. According to the theory of island biogeography, the total number of its bat species should be than on the current island because the rate of immigration to the new island should be and the rate of extinction should be . greater; lower; higher greater; higher; lower smaller; lower; higher smaller; higher; lower