Question

use what you know about natural selection to fill in the blanks in the hypothesis. it should answer the lab question, “what is the effect of the type of food available on the frequency of different types of bird beaks?”
hypothesis: if the type of food available changes,
then...
...because...

Explanation:

The hypothesis follows natural selection principles: birds with beak shapes suited to the new food source will survive and reproduce more, increasing their beak type's frequency. The reasoning ties to differential survival/reproduction based on trait fitness.

Answer:

If the type of food available changes,
then the frequency of beak types that are well-suited to eating the new food will increase, and the frequency of poorly suited beak types will decrease
...because...
birds with beaks adapted to the available food will be more likely to survive, reproduce, and pass on their beak traits to offspring, following natural selection.