Question

which of these is an example of natural selection?
○ change in food causes changes in the shapes of bird beaks.
○ species fight for limited resources.
○ insects die because they are sprayed with a bug killer.

Explanation:

Natural selection is the process where traits that help organisms survive and reproduce become more common in a population over time. When food sources change, birds with beak shapes suited to the new food will survive better, reproduce more, and pass on that trait, which is a classic example of natural selection. The other options describe competition (not selection itself) and artificial/non-selective death, not natural selection.

Answer:

A. Change in food causes changes in the shapes of bird beaks.