2. How Did Darwin Explain Evolution? Hw: Rd 418 – 422 Q 1-4 p 422

3. On The Origin Of Species Published in 1859 by Charles Darwin Explained his theory of evolution by Natural Selection

4. Natural Variation and Artificial Selection Natural variations are differences among individuals of a species. (For example some horses are slow and some are fast) Selective Breeding (Artificial Selection) is allowing only the fastest horses, the largest hogs and the cows that give the most milk to produce offspring. This produces faster horses, larger hogs, and cows that make more milk

5. Darwin’s Theory Of Evolution By Natural Selection The Struggle for Existence Survival Of The Fittest Descent With Modification

6. Struggle For Existence Members of each species compete regularly for food, living space and other necessities of life. For example: a faster predator will have and advantage over a slower one.

7. Survival Of The Fittest The ability of an individual to survive and reproduce in its environment is called fitness Fitness is a result of adaptations An adaptation is any inherited characteristic that increases an organism’s chance of survival Individuals that are better suited to their environment (have high levels of fitness) survive and reproduce most successfully

8. Descent With Modification Each living species has descended, with changes, from other species over time

9. Evidence Of Evolution Fossil Record Geographic Distribution of Living Species Homologous Body Structures Similarities in Early Development