The man credited with the term natural selection.
Charles Darwin
Minerals fill in the spaces left by a decayed organism.
Cast fossil
When two organisms evolve alongside one another.
coevolution
General term for dating of fossils or rock layers by comparing them to one another.
Relative Dating
The disappearance of a species.
Extinction
The species of bird Darwin studied on his travels.
finches
Evidence of an organisms activity.
Trace fossil
Small changes in a population over a relatively short period of time.
microevolution
This principle states the youngest layers of rock are on the top and the oldest layers are on the bottom.
Law of Superposition
One possible explanation for the extinction of the dinosaurs.
Answers may vary
The islands where Darwin studied lots of unique species.
Galapagos Islands
When the actual organism is preserved by ice or tree sap.
True form/body fossil
Large changes (like evolving into a completely new species) over a very long period of time.
macroevolution
A dating technique that gives the exact age of an organism.
Absolute Dating
When multiple species all go extinct at one time.
Mass Extinction
The name of this bird.
Blue-Footed Boobie
When an organism is buried in sediment and then decays leaving an empty space (impression).
Mold fossil
Similar structures that related species have inherited.
Homologous Structures
Consists of all of the fossils ever discovered.
Fossil Record
Explain why scientists and farmers use selective breeding and genetic modification.
To breed organisms for specific desired traits.
The name of the ship on which Darwin traveled.
HMS Beagle
Fossils present in only one period of geologic time, are abundant during that period, and are widespread. Useful for dating other fossils or rock layers in which they are found.
Index Fossil
Body parts that don't look similar to other organisms but have a similar function.
Analogous Structures
Used to determine past climates and volcanic activity.
Ice Cores
Fossils that show a mix of primitive and modern features.
Transitional Fossils