1. 15-1 The Puzzle of Life’s Diversity
Pgs
BIOLOGY
Baker

2. Evolution A change over a period of time.
Studied using a collection of facts, observations and hypothesis about the history of life.
HOMO HABILIS
The first Homo
million years ago

3. Charles Darwin (1809 – 1882) Naturalist from England
Wrote – The Origin of Species.
Sailed on the HMS Beagle – a research ship

4. HMS Beagle (1831 – 1836) Cruised around the world.
Collected data from organisms all around the world.
Collected plant and animal species – including fossils.

5. Charles Darwin’s conclusions
Called the variety of living organisms he observed a living diversity.
Used the word fitness to describe the ability of an organism to survive and reproduce.

6. Adaptations
Physical and behavioral traits that enable an organism to survive.
Ex: Hawk’s hooked beak, school behavior

7. Influences on Darwin’s thinking
Charles Lyell – a geologist.
Thomas Malthus – an English economist.

8. Charles Lyell (1797 – 1875)
Modern world is being shaped by the same forces that were at work millions of years ago.
Believed the Earth was much older than people originally thought.

9. Thomas Malthus (1766 – 1834)
Observed babies being born faster than people were dying.
Something would soon happen to limit human population – war, famine, or disease.