Evolution

4. Procedure used to determine the age of rocks or fossils by measuring how much of the radioactive materials in each sample were broken down.
7. Evolution of a new species that occurs when some members of an original species become geographically separated from the rest of the species.
8. Diagram that shows how species are related to each other through common ancestors.
9. Describes the combination of alleles that an individual has for a certain gene.
11. features that are passed from one generation to the next
14. Traits that allow a plant, animal, or other organism to survive and reproduce in its environment
15. English natural scientist who deloped the theory of evolution.
16. Characteristics of an organism that depend on how the organism’s genotype is expressed.
17. Process in which organisms evolve traits useful to humans because people select which individuals are allowed to reproduce and pass on their genes to successive generations.
20. Scientist who finds and studies fossils to learn about evolution and understand the past.

1. Structure that evolution has reduced in size because it is no longer utilized; examples include the human tailbone and appendix.
2. Evolution of a new species that occurs without geographic separation first occurring between members of an original species.
3. Process by which a new species evolves.
5. Earth scientists use radiometric dating, index fossils, and other clues. They have determined that Earth is 4.6 billion years old. The planet is the same age as the rest of the solar system.
6. traits that organisms develop over a lifetime
10. The first forms of life had to be simple single-celled organisms Fossils of blue-green algae found in Australia are the oldest fossils of life forms on Earth. They are at least 3.5 billion years old
12. inherited traits of a population change over time.
13. a person who studies human history and prehistory through the excavation of sites and the analysis of artifacts and other physical remains.
18. Study of how organisms develop from a fertilized egg.
19. Something left behind by a once-living organism. Fossils can be things like bones or footprints.