Darwin’s Voyage

Galapogas Islands’ organisms

Giant Tortoises Blue Footed Booby

Iguana Sally Light Foot Crab

Similarities and Differences

Cormorant Galapagos Cormorant

Iguana Galapagos Iguana

Galapogas Finches

Evolution

• Darwin thought that species gradually changed over many generation and become better adapted to the new conditions.

Natural Selection

• The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.

Overproduction

• Most species produce far more offspring than can possibly survive.

Competition

• Organisms compete for resources like food, water, and space in order to survive and reproduce.

Variations

• Differences between individuals of the same species.

Selection• Over a long period of time, natural selection can lead to evolution. Helpful

variations gradually accumulate in a species while unfavorable ones disappear.

The case of the English Peppered Moth

• The industrial revolution of the 1700’s turned the trees black which favored the black variety.

New Species Formation• A new species can form when a group of individuals

remains separated from the rest of its species long enough to evolve different traits.

Kaibab SquirrelAbert Squirrel

Continental Drift

• Hundreds of millions of years ago, a supercontinent existed named Pangea. When the continents drifted apart, organisms became separated and evolved to survive in their new environment.