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chapter 6 vocab
changes over time
Term | Definition |
---|---|
Natural Selection | The process by which individuals are better adapted to their environment and are more likely to survive and reproduce is called... |
Variation | Any difference between individuals of the same species is a... |
Half Life | The time it takes for half of the atoms in a sample to decay is its.. |
Scientific Theory | A well tested concept that explains a wide range of observations is a... |
Punctuated Equilibrium | The theory that species evolve quickly during short bursts of time is... |
Fossil Record | Documentations of the millions of fossils scientists have collected over the time is called the... |
Radioactive Elements | Unstable elements that decay or break down into different elements are... |
Homologous Structure | Similar structures that are related species have inherited from common ancestors are called... |
Mold | A hollow space left where the fossil has decayed or dissolved is called... |
Relative Dating | A process comparing the age of two fossils by their placement in the layers of sedimentary rock layers is... |
Evolution | Gradual changes in a species over time is called... |
Petrified Fossils | Fossils that are buried in sediments and actualy changed to rock are... |
Adaptation | A trait that helps an organism survive and reproduce is an... |
Gradualism | The theory that evolution occurs slowly but steadily is... |
Branching Tree | A diagram that shows how scientists think different groups of organisms are related is a... |
Radioactive Dating | A process that tests the radioactive materials within a fossil to tell its actual age is called... |
Fossils | Perserved remains of an organism that lived in the past are... |
Extinctism | When no member of the species is still alive it is called... |
Cast | A copy of the shape of the organism made is called... |
Competition | This is a factor in Natural Selection as organisms attempt to survive using the same limited resources |
Homologous Structure | Evidence that related species have a common ancestor because of the way their bodies are anatomicall constructed in similar ways. (dolphin flipper, bird wing, dog leg) |
Overproduction of Offspring | This factor in Natural Selection happens when there are more offspring that can possibly survive on the given resources |
Species | A group of organisms that can mate together and produce offspring. |