Set up Cornell Notes on pg. 23

•Topic: 10.2 Darwin’s Observations

•Essential Question:

1.(bottom half of p.22) Make a double-bubble map comparing and contrasting variation and adaptation (give examples of each)

2.1 Atoms, Ions, and Molecules10.2 Darwin’s Observations

1. (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.

10.2 Darwin’s Observations

KEY CONCEPT Darwin’s voyage provided insight on evolution.

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

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

10.2 Darwin’s Observations

BIRD BEAK BUFFET

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).

1. Choose a beak (each table must have at least one of each) and have a stomach (cup)

2. Pour out the first food source into the pie tin.

3. When I say “go” you will have 10 seconds to eat as much as you can (pick up and put in your stomach)

4. Record your data

5. Repeat for all three foods.

10.2 Darwin’s Observations

Variation- is the difference in the physical traits of an individual from those of other individuals in the group to which it belongs

Darwin noticed the variation of traits among similar species that he observed in his travels…

10.2 Darwin’s Observations

Interspecific variation

Variation among different species

Intraspecific variation

Variation among the same species

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

10.2 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.

10.2 Darwin’s Observations

What adaptations do these animals have? Why do they need those adaptations?

Camel Cheetah

Giraffe

Mountain Goat

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.

10.2 Darwin’s Observations

Darwin observed differences among island species.

– Domed tortoises live in wet areas rich in mosses and short plants

– have shorter necks and legs

– Saddle-back tortoises that live in areas with tall plants

– have long necks and legs

Grizzly Bear Polar Bear

Killer Whale Blue Whale

vs.

vs.

Interspecific variation: is variation among individuals of different species

Interspecific Variation

10.2 Darwin’s Observations

• Darwin found fossils of extinct animals that resemble modern animals.

GlyptodonArmadillo

Darwin observed fossil and geologic evidence supporting an ancient Earth.

10.2 Darwin’s Observations

• 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.

Darwin observed an Earthquake

• Darwin found fossil shells high up in the Andes mountains.