Across
- 1. history of life in the geologic past presented by remains of once living things
- 5. inherited trait that helps an organism survive and reproduce in its environment
- 9. differences within a species
- 10. a rock that forms from compressed or cemented layers of sediment
- 12. organisms that are related and can mate to produce fertile offspring
Down
- 2. matter that settles to the bottom of a liquid or material deposited by water, wind, or glaciers
- 3. when every member of a species is dead
- 4. method used to determine the exact age of an object by comparing radioactive isotopes to stable isotopes
- 6. opinion proven by observation and scientific proof
- 7. the fossil remains of an organism that lived in a specific geologic age that is used to date the rock or rock layer it is found in
- 8. organisms that have advantageous traits and reproduce more successfully than others do
- 11. theory introduced by Charles Darwin...inherited characteristics within a species