Sarah is so excited that a robin has built a nest right outside her office window.She watches daily as the parents take turns sitting on the three eggs,until they finally hatch.Now she sees three little beaks point up at the sky every time one of the parents arrive.But one day,Sarah notices only two little beaks are waiting to be fed,and she wonders what happened to the third bird.In what way would this example help Darwin explain the diversity of life on earth?
A) Not all animals that are born will survive long enough to reproduce.
B) Selective breeding in animals can lead to dramatic changes in appearance.
C) Fossil Evidence Indicates Subtle Changes In Species Over Time.
D) Similarities among organisms show how they're related.

Question

Quizplus · Accepted Answer

This example illustrates the concept of natural selection, which is a key aspect of Darwin's theory of evolution. The death of one of the baby birds could be due to a number of factors, including competition for resources, predation, or disease. Ultimately, not all individuals will survive long enough to reproduce, and those that do will pass on their genetic traits to their offspring, shaping the diversity of life on earth over time.

Sarah Is So Excited That a Robin Has Built a Nest