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Evolution
| Term | Definition |
|---|---|
| Species | a group of similar organisms that can mate with each other and produce fertile offspring |
| fossil | the preserved remains or traces of an organism that lived in the past |
| adaptation | a trait that helps an organism survive and reproduce |
| evolution | the gradual change in a species over time |
| scientific theory | a well-tested concept that explains a wide range of observations |
| natural selection | the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species |
| variation | any difference between individuals of the same species |
| homologous structure | similar structures that related species have inherited from a common ancestor |
| branching tree | a diagram that shows how scientists think different groups of organisms are related |
| petrified fossils | remains that become buried in sediments that are actually changed to rock |
| mold | hollow space in sediment in the shape of an organism or part of an organism |
| cast | a copy of the shape of the organism that made the mold |
| relative dating | a technique used by scientists to tell which of two fossils is the oldest |
| radioactive dating | technique used by scientists that actually determines the actual age of fossils |
| half-life | the time it takes for for half of the atoms in a sample to decay |
| fossil record | the millions of fossils that scientists have collected |
| extinct | no members of a species are still alive |
| gradualism | evolution occurs slowly but steadily |
Created by:
carlocrew
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