Question

why did this pattern emerge? on san cristobal, large beaks are required to eat the fruit produced by cacti. small beaks are required to spear and eat insects. by increasing the number of insects and cacti on the island, you favor both finches with small and large beaks. finches without either of these two traits are not favored. over time there are less and less average - beaked birds in the population. this process where the average version of a trait is not favored is called disruptive selection. fill out the table below. birds in this region food source

Explanation:

The text describes that on San Cristobal, finches with small beaks eat insects and those with large beaks eat cactus - fruit. Disruptive selection favors these two extreme traits over the average trait. For the table, we match the birds to their food sources based on beak - size requirements.

Answer:

BIRDS IN THIS REGION	FOOD SOURCE
Finch with large beak	Cactus fruit