1. Set up Cornell Notes on pg. 23
Topic: 10.2 Darwin’s Observations
Essential Question:
(bottom half of p.22) Make a double-bubble map comparing and contrasting variation and adaptation (give examples of each)
10.2 Darwin’s Observations
2.1 Atoms, Ions, and Molecules
(bottom half of p.22) Make a double-bubble map comparing and contrasting variation and adaptation (give examples of each)
KEY CONCEPT:
Darwin’s voyage provided insight on evolution.

2. 10.2 Darwin’s Observations
KEY CONCEPT Darwin’s voyage provided insight on evolution.

3. 10.2 Darwin’s Observations
Charles Darwin
Educated in Natural History
Hired on the HMS Beagle as the ship’s naturalist
He collected many organisms
He formulated the idea that each species had developed from ancestors with similar features

4. The Voyage of the Beagle
10.2 Darwin’s Observations
The Voyage of the Beagle
In 1831 The HMS Beagle set sail
The voyage took 5 years
He read Lyell’s Principles of Geology
Darwin spent most of his time on shore observing species, where he found much evidence supporting Lyell’s views

5. 10.2 Darwin’s Observations
BIRD BEAK BUFFET

6. 10.2 Darwin’s Observations
Follow the rules!
On the top half of page 22, create the table that you see on your directions. (Leave room to answer a short question underneath).
Choose a beak (each table must have at least one of each) and have a stomach (cup)
Pour out the first food source into the pie tin.
When I say “go” you will have 10 seconds to eat as much as you can (pick up and put in your stomach)
Record your data
Repeat for all three foods.

7. 10.2 Darwin’s Observations
Darwin noticed the variation of traits among similar species that he observed in his travels…
Variation- is the difference in the physical traits of an individual from those of other individuals in the group to which it belongs

8. 10.2 Darwin’s Observations
Interspecific variation
Variation among different species
Intraspecific variation
Variation among the same species

9. 10.2 Darwin’s Observations
During Darwin’s journey he noticed that the differences among the species seemed well suited to the animals’ environment and diet
These observations led Darwin to realize that species may somehow be able to adapt to their surroundings

10. 10.2 Darwin’s Observations
An adaptation is a feature that allows an organism to better survive in its environment.
Species are able to adapt to their environment.
Adaptations can lead to genetic change in a population.

11. 10.2 Darwin’s Observations
What adaptations do these animals have? Why do they need those adaptations?
Camel
Cheetah
Mountain Goat
Giraffe

12. 10.2 Darwin’s Observations
Compare these two tortoises. Note their looks and think about what type of food they would be able to eat.

13. Darwin observed differences among island species.
10.2 Darwin’s Observations
Darwin observed differences among island species.
Saddle-back tortoises that live in areas with tall plants
have long necks and legs
Domed tortoises live in wet areas rich in mosses and short plants
have shorter necks and legs

14. Interspecific Variation
vs.
Polar Bear
Grizzly Bear
vs.
Blue Whale
Killer Whale
Interspecific variation: is variation among individuals of different species

15. 10.2 Darwin’s Observations
Darwin observed fossil and geologic evidence supporting an ancient Earth.
Darwin found fossils of extinct animals that resemble modern animals.
Glyptodon
Armadillo

16. 10.2 Darwin’s Observations
Darwin found fossil shells high up in the Andes mountains.
Darwin observed an Earthquake
He saw land move from underwater to above sea level
Supported the theory that small daily geologic activity can lead to great changes over time
Darwin extended his observations to the evolution of organisms.