Which bird was most successful in the first 500,000 years?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food