Darwin noticed that birds that were good at finding scarce food in the winter had a better chance of surviving and producing offspring. What did he call this struggle for existence? artificial selection natural selection differential reproduction differential overproduction

The correct answer is natural selection.

Explanation:

The differential survival and reproduction of the individuals because of the variations in the phenotype are known as the natural selection. It is an essential mechanism of evolution, that is, the modification in the heritable traits feature of a population over generations. The term natural selection was given by Charles Darwin in oppose to artificial selection, which is on the basis of his opinion is intentional, while natural selection is not.

Natural selection, in which the fittest organisms are the most capable to survive and reproduce.