1. Take this time to work on your Pangea Puzzle
It will be due tomorrow. Make sure you have:
Cut, color, and glue the pieces to look like Pangea. Use the key to help you fit the pieces into the correct places
Take this time to work on your Pangea Puzzle
Finished? Go to 8th GRADE SYMBALOO and click on “Who Wants to Live A Million Years”

5. What is Evolution? Evolution is how things change over time.
In biology, evolution is how a population changes over time

6. How Life has Changed
The fossil record provides evidence that species have evolved over time. But how and why have they changed?

7. Charles Darwin Known as the “father of evolution”
Studied finches in the Galapagos Islands

8. Why were the finches so different from island to island?
Charles Darwin
Why were the finches so different from island to island?

9. Why were the tortoise’s so different from island to island?
Charles Darwin
Why were the tortoise’s so different from island to island?

10. Charles Darwin
Adaptation – a trait that helps an organism survive and reproduce
Finches that ate insects had sharp beaks. Finches that ate seeds had strong, wide beaks

11. Charles Darwin But how can a species evolve?
Darwin's conclusion was that the species gradually evolved over many generations and became better adapted to the different environments.
But how can a
species evolve?

12. How does Evolution occur?
Darwin proposed that evolution occurs through the process of natural selection.

13. But what helps a species survive?
Natural Selection is the process where organisms that are best suited to their environment survive and pass on their genetic traits
But what helps a species survive?

14. What helps a species survive
1. Competition

15. What helps a species survive
2. Beneficial Mutations
Common mutations: freckles, red hair, blue eyes

17. What helps a species survive
3. Overproduction

18. What helps a species survive
4. Variation

19. Variations in a Species
A variation is any difference between individual species
Some variations make individuals better adapted to their environment meaning that they will more likely survive and reproduce

20. Darwin's Evolution points to the idea of a Common Ancestor
Meaning that all life came from 1 thing, and has slowly evolved over time

21. Evolutionary Tree – shows the relationships between various organisms

22. Homologous Structures: same structure but different functions
This supports the idea of a “Common Ancestor”