1. Patterns of Evolution

2. Extinction
More than 99% of all species that have ever lived are now extinct
Reasons for extinction
Competition for resources
Environmental change
Some species adapt and survive (others do not)

3. Divergent Evolution (Adaptive Radiation)
Many diverse species evolved from a similar, common ancestor
Ex: Galapagos finches
Occurs due to natural selection, etc.

4. Adaptive Radiation

5. Convergent Evolution Unrelated organisms come to resemble one another
Ex: shark and dolphin

6. Coevolution
Two or more species evolve in response to changes in each other over time
Often occurs with organisms that are closely connected with one another
Symbiotic relationships!
Ex: Many flowering plants can reproduce only if the shape, color and odor of their flowers to attract specific pollinators
Bees are attracted to certain types of plants and butterflies are attracted to certain types of plants (some may be the same, others may be different)

7. Punctuated Equilibrium
Long stable periods are interrupted by brief periods of more rapid change