Darwin’s Voyage
description
Transcript of 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.