1. Tree of Life
Fossil Clip
Age of Earth Clip

5. Lamarck’s idea of use & disuse

6. Lamarck’s idea of use & disuse

7. Lamarck’s idea of use & disuse

11. An Adaptation is any trait that increases fitnessgg Gg GG gg Gg
An Adaptation is any trait that increases fitness
Darwin Vid

12. Darwin’s theory of Natural Selection
Because of genetic variation in the giraffe population, some giraffe necks were longer than others. Making some individuals more fit.

13. Darwin’s theory of Natural Selection
The giraffes with the more desirable traits lived longer and healthier and were able to pass their genes for longer necks to the next generation.

14. Darwin’s theory of Natural Selection
In the next generation there were more genes in the population for longer necks.

25. Reproductive Isolation
Original Population
Geographic Isolation
Population is split and cannot interbreed
Changes occurred in one population that did not happen in the other
Reproductive Isolation
Population is reunited but no longer interbreeds

28. There are an estimated 50 million species of living things on Earth.
Scientists have identified about 2 million of them
This branch of science is called taxonomy
A system in order to classify all of these species had to be established

29. Scientists use the organisms genus and species for their scientific names.
This is called binomial nomenclature