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Centaurus evolution
| Question | Answer |
|---|---|
| Continental drift | the land masses of the earth slowly move |
| Darwin | man who lived in the 1800s; proposed the theory of natural selection, the idea that organisms evolve |
| Fossil | formed when an organism dies and is covered by mud or lava; found in rocks |
| Radioactive dating | way to find out how old something is by looking at radioactive molecules and how they have changed; used for very old things, like rocks and the earth |
| Morphological evidence | evidence from the form or shape of an organism |
| Biochemical evidence | evidence from the molecules of an organism |
| Evidence | anything that is used to say that something is true |
| Organism | a living plant, animal, bacteria or virus |
| Population | group of organisms of the same species that live together |
| Species | group of organisms that have common ancester and can interbreed or mate; for example, polar bears, grizzly bears and pandas are three separate species because they cannot mate with each other |
| Adaptation | changes in behavior or structure in an organism to fit the environment better; for example, birds develop stronger beaks to eat harder seeds |
| Natural selection | a process where organisms that are adjusted better to the environment tend to reproduce more and pass their genetic traits on to their young |
| Competition | the use of the same limited resource by two or more species |
| Absolute dating | find the specific date or exactly how old something is |
| Relative dating | find out that something is older or younger than something else; don’t find exactly how old something is |
| Radiometric dating | way to find out how old something is by looking at radioactive molecules and how they have changed; used for very old things, like rocks and the earth |
| Half-life | the amount of time it take for half the atoms in a radioactive sample to decay |
| Geologic time scale | times cover the whole history of the earth |
| Fossil record | all the fossils that have been found |
| Evolution | genetic changes in populations of organisms over generations |
| Diversity of life | the range or variety of organisms that exist |
| Adaptation | when an organism is better suited to its environment; part of natural selection |
| Fitness | physcical state of well-being; how healthy an organism is |
| Vestigial organs | a structure in a human that is similar to a structure in another animal but it no longer works the same way; examples are the appendix, tailbone |
| Homologous structures | two structures in two different organisms that seem to be the same |
| Artificial selection | same as selective breeding; a person mates two organisms to get better offspring |
| Common descent | a group of organisms that have a common ancestor |
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