Certain seed-eating birds are able to crack seeds according to the size of their beaks. Long beaks are able to crack larger seeds, whereas shorter beaks are able to crack smaller seeds. A graph of a bird population with different-sized beaks is shown below. After a several-year drought, smaller seeds became scarce, but drought-resistant trees continued producing larger seeds. What graph would best predict the change in beak length of the bird population?

The graph that would best predicts the change in the break length of the bird population is that of the third graph.

The seed-eating birds includes the Sparrows and finches, and redpolls. Grouse has different sizes of beaks as per the body ratio. Evolution and natural selection play a crucial role in the development of the beaks. The shape of the break determines the type and shape of seed it will eat.

As per the graph given the length of beaks will increase as the number of individual birds increases. Thus the diversity of breaks depends on the diversity of the species. Hence the option C is correct.

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