Vocab
Variation among organisms in a ecosystem
Diversity
The total number of fossils that have been discovered and the information derived from them is called the __________ _________
fossil record
What are the four things a fossil record docuemnts?
1. Existence
2. Diversity
3. Extinction
4. Change of many life-forms throughout history.
Remains, impressions, or traces of an organism that lived in the past
Fossils
Fossils can usually be found in layers of _______ ________
sedimintary rock
The state of no longer existing
Extinction
The approximate age of fossils can be determined by putting them into _______ ________ based on the location of sedimentary layers in which they were found.
chronological order
Rock formed in layers form reposition and solidifcation
Sedimentary Layers
Scientists can determine the relative age of rocks using a technique called _______ _______ which measures the amounts of a radioactive subtsance and its decay.
radioactive dating
The mineralized reamins of organisms and the tock layers in which they are found
Fossil Record