1. Natural Selection and Evolution of mammals
6:40

2. Evolution are the changes in the gene pool of a population over time.
Natural selection process by which individuals that are better suited to their environment survive and reproduce most successfully.
Adaptation is an inherited characteristic that increases an organism’s chance of survival.
13:13

3. Galåpagos Islands Darwin Wolf Pinta Marchena Genovesa Santiago
Isabela
Darwin
Wolf
Pinta
Marchena
Genovesa
Fernandia
Santiago
Bartolomé
Råbida
Pin zon
Seymour
Baltra
Santa Cruz
Santa Fe
Tortuga
Española
San Cristobal
Floreana
EQUATOR
Galåpagos
Islands

5. Marine Iguana
Land Iguana

7. insect and nectar eaters
FOUNDER SPECIES
insect and nectar eaters
fruit and seed eaters
KAUAI AKIALAOA
AMAKIHI
IIWI
APAPANE
KONA FINCH extinct
LAYSAN FINCH
AKIAPOLAAU
MAUI PARROTBILL

8. Based on his observations, Darwin proposed that EVOLUTION occurs by NATURAL SELECTION.

9. Darwin’s Postulates 1. Individuals within populations vary.
2. Some of these variations are passed on to offspring.
3. In every generation some individuals are more successful in surviving or reproducing than others.
4. Survival and reproduction are not random Individuals with the most favorable variations are more likely to survive and reproduce.

10. MONOTREMES
Platypus
Spiny anteater

11. MARSUPIALS
Koala
Tasmanian Devil

12. PLACENTAL MAMMALS
Bat
Arctic Fox
Walruses
Manatee

13. DIVERGENCE approximately 40 million years ago
SPECTACLED BEAR
SLOTH BEAR
SUN BEAR
BLACK BEAR
POLAR BEAR
BROWN BEAR
RACCOON
RED PANDA
GIANT PANDA
DIVERGENCE
million years ago
DIVERGENCE approximately
40 million years ago
Fig , p. 319