Old world monkeys
Australopithecus and Homo
Africanus and habilis
Homo and sapiens
Australopithecus and Anthropida
They only buried the heads of the dead.
Scavengers can carry off the smaller bones much more easily.
Skulls tend to look more like rocks.
Other hominids cannibalize their dead.
Help determine the relative age of the fossil
Keep the fossil from rotting
Provide visual context for where the fossil was found
Provide a keep-sake of the discovery
Endocasts of the brains
Written historical records
Embryos of very different organisms have very similar developmental stages.
A bats wing and a whales flipper have very similar bone structure.
Large, flightless birds are found on different continents: Australia (Emu), Africa (Ostrich), and Rhea (South America).
More primative fossils are found below more complex fossils in the rock layers.
Only 6000 years old.
Only 2000 years old.
Less than 6000 years old.
Much more than 6000 years old.
The founder effect
Bipedalism frees the hands to use tools
Bipedalism frees the hands to carry food
Bipedalism frees the hands to carry young
Bipedalism frees the hands to walk faster