A group of 100 birds live on an isolated island. Half of the birds have thick, heavy beaks, and the other half have long, thin beaks. The only food source on the island is insects. What will happen to the population three generations in the future? 1. The heavy beaks will increase and the thin beaks will decrease
2.the heavy beaks will decrease and the thin ones will increase
3.The numbers of both types of beak will increase
4.The numbers of both types of beak will remain about the same