SCENARIO THESE FINCHES HAVE A VARIETY OF BEAK SIZES AND SHAPES (CHARACTERISTICS)
PRINCIPLE OF EVOLUTION OCCURRING:
HOW DO YOU KNOW?
IN A WORLD WHERE BUGS BECOME SCARCE WHICH FINCH (OR FINCHES) WOULD BE SELECTED FOR?
Answer: Beaks that are capable of eating food other than bugs.
Explanation: Choosing a Finch with a beak that is capable of eating fish, and/or taking food out from a cactus is one that would survive in a world where bugs become scarce.