1. (7th) Chapter 7-1 Cornell Notes
Darwin’s Theory

2. Chapter 7-1: Key Questions
How did Darwin account for the diversity of species and the differences between similar species?
How does natural selection lead to evolution?

3. Chapter 7-1: Key Terms species- fossil- adaptation- evolution-
scientific theory-
natural selection-
variation-
Chapter 7-1: Key Terms

4. Chapter 7-1 Paragraph 1 1831: Charles Darwin set sail on HMS Beagle;
Observations: diversity of organisms/remains of ancient organisms;
characteristics of organisms on Galapagos Is;
species: group of similar organisms that can mate and have fertile offspring;
fossil: preserved remains/traces of organism from the past.

5. Chapter 7-1 Paragraph 2
1835: noticed plants/organisms on islands similar to mainland;
but big differences also;
inferred some species came to islands from mainland and changed over time;
changes like size/shape of bird beaks on finches;
Example of adaptation: trait helps organisms to survive/reproduce;
hypothesized some species faced environmental change and developed into new species;
evolution: gradual change in species over time;
scientific theory: well-tested concept that explains wide range of observations.

6. Chapter 7-1 Paragraph 3 Darwin wrote “The Origin of Species”;
proposed that evolution occurs through natural selection;
natural selection: process where better adapted individuals better chance to survive than other members same species;
Factors:
overproduction;
competition;
variations;
Darwin: natural selection, over a long time, can lead to change;
variations important otherwise natural selection would not happen.