1. 15.3
Objective: to be able to explain how Darwin presented his case to others

2. publishing
Darwin published “On the Origin of Species…” Darwin waited 25 yrs to publish---why? Wallace wrote an essay about the same topic, 25 yrs after Darwin thought of publishing

3. Nat’l selection
Darwin proposed a mechanism for evolution natural selection!! He explained artificial selection people chose traits being passed on (dairy cows)

4. Nat’l selection
For natural selection to happen Struggle for existence-> competition for resources Fitness- Ability to survive and reproduce

5. Nat’l selection Survival of the fittest- Adaptation-
The best suited to the env. Will survive
Adaptation-
Inherited characteristic that increases chance of survival
Can be- physiological, behavioral, structural

6. Nat’l selection
Natural selection- Characteristic that helps an org. survive/reproduce in an env. Will be passed on Common descent- All living things were derived from common ancestors

7. evidence
Evidence for evolution Fossil record comparing older fossils with newer ones to see changes Embryology- most embryos develop similarly at first.

8. evidence
Homologous structures similar structure, different function Analogous structures similar function, different structure