Continuing the line Genes Mating rituals Chemical signals Multiple mates Competition

In the battle of Natural Selection against the Inheritance of Acquired Traits

 Youngest of eleven kids  Military family  Expert in plants of France  Philosophie Zoologique, book  Continued with research, living a poor's mans life

 Species never become extinct instead they continue to change over time  Animal species change over time, due to the changes in their environment  Change occurs not by chance

 1. Tendency toward perfection If an animal wanted to change something, it could Through the study of fossils species started out simple and moved toward complexity  2. Use and Disuse If you don’t use it you will lose it  3. Inheritance of acquired traits Changes made during an animal’s life could be passed down to its offspring

 Fiddler Crab Use  Mole disuse

 Always enjoyed science growing up but wasn’t fit for medical school Sent to Cambridge with the intention on becoming a clergyman  Loved sports and entomology  Almost didn’t make the voyage on the Beagle as the ships naturalist

 1. Change over time Pre-existing variation  2. Variation within a population or species Everyone is just a little different  3. Natural selection Survival of the fittest

1. Organisms have changed over time. 2. Organisms changed because they wanted to survive. 3. There was variation in a population. 4. Certain traits helped organisms survive and reproduce better than other organisms without those traits. 5. Organisms can never become extinct. 6. The environment had something to do with why organisms changed.

7. Parents are able to pass on at least some of their traits to their offspring. 8. Parents are only able to pass on traits that they were born with. 9. Organisms could decide to change something about their body and pass on that change to their offspring. 10. Organisms are still changing.

 Lamarck 1 st C 2 nd D 3 rd A 4 th B  Darwin 1 st A 2 nd C 3 rd B 4 th D

 Galápagos= saddle back Each island has a distinct tortoise that has made a home there

 Variation is very evident when visiting island after island