These four finch species lived together on an island. each species ate something different: large seeds, small seeds, insects, and leaves. as more people moved to the island and built houses, the available finch food changed. there were fewer seeds of any kind for the finches to eat. we would expect, over time,

The population of seed eating finches will disappear.

Explanation:

Lower availability of seeds as food would make the seed eating finches starve. The insect and leaves eating finches would be favored by natural selection as their food choices were available. With time, seed eating finches would disappear from the population while the other two types would exhibit increase in their number.