Charles Darwin (1809-1882)and

The Galapagos Islands

Darwin’s IdeasThe diversity of living species was far

greater than anyone had previously known

These observations led him to develop the theory of evolution

Darwin’s Finches

Environmental adaptation

Each islandhad its own type of tortoises and finches that were clearly different from other islands

List reasons why the tortes and finches would be different?

EvolutionEvolution is a well supported explanation of phenomena that have occurred in the natural world

A theory in science is a well tested hypothesis, not just a guess

What is the evidence that supports evolution?

The Grand Canyon

700 – 1,100 million years

300 – 500 million years

280 – 300 million years

270 – 280 million years

Rock layers take time to form. Processes can be seen in action today.How can fossils (remains of organisms) in these rocks be evidence of evolution?

Relative datingHow can rock formations/layers

containing fossils (remains of organisms) be

evidence of evolution?

Carbon 14/Carbon 12

Carbon 14/Carbon 12

ratio changes after death

of an organism giving

age estimate.

Evolution of Whales

Look at the diagrams comment them

The effect of environment on the species. The effect of use and disuse of organs andThe inheritance of acquired characters.

Lamark (1801-1809)Theory of acquired characteristics

Give a reason why a giraffe may have acquired a longer neck?