• give live birth
• warm blooded
• have hair
• same bones in the front limbs
• have lungs no gills
• remnants of hind legs
• nasal passages are the blow hole
• give milk to their young

• nasal passages migrate to the top of the head (blow hole)
• both have arm and leg bud

• "in between" species found nasal passages in the middle of the skull
• some with entire hind legs but found with other sea creatures
• short legs and flat toes = strong swimmers

• closest DNA match to a whole is the hippo.
• whales and hippos share a common ancestors

was a doctor

earned a degree in theology

was a naturalist

• the Earth was formed over a long period of time - geologist
• species can produce more offspring that can survive - Thomas Malthus
• Changes in animals and plants can happen in a few generations - farmers and breeders
• selective breeding produces individuals with certain traits - farmers and breeders
• disease and stravation affect populations - Thomas Malthus

1. overpopulation
2. genetic variation
3. struggle to survive
4. successful reproduction

ostriches: fast and slow

fast will survive and reprocude

slow will be captured and killed

natural selection is survival of the fittest

artificial selection - ????????????????????????