Question

multiple choice 2 points
which is the most likely evolutionary response of birds to a food supply of insects living in deep, narrow tunnels?
○ birds get smaller with each generation, until they can fit inside the tunnels.
○ birds learn to plug up the tunnels, forcing the insects to the surface for air.
○ birds begin eating bark and leaves instead.
○ birds beaks get progressively longer and thinner with each generation.

Explanation:

Evolutionary responses involve heritable traits that improve survival/reproduction. Birds with longer, thinner beaks would be better able to reach insects in deep, narrow tunnels, so these traits would be passed to subsequent generations through natural selection. The other options describe non-heritable changes or non-adaptive behaviors that do not fit evolutionary adaptation.

Answer:

D. Birds' beaks get progressively longer and thinner with each generation.