Science: Chapter 6 definitions- Evolution
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| species | A group of organisms whose members sucessfully reproduce among themselves.
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| evolution | The changes that occur over time in hereditary features.
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| natural selection | Darwin's theory says that organisims best adapted to their enviromen are more likely to survive and pass their traits to offspring.
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| variation | The occurance of an inherited trait that makes an individual different from other members of the same species.
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| gradualism | A model of evolution, showing a steady , slow, and continious change of one species into new species.
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| punctuated equilibrium | A model of evolution, showing the rapid change of a species caused by the mutation of just a few genes.
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| fossils | The remains of life from an earlier time.
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| sedimentary rock | A type of rock formed when fine particles like mud and sand settle out of water and become cemented together.
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| relative dating | Estimating the age of a fossil by comparing it to younger fossils in the rock layers above and to older fossils in rock layers below.
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| radioactive element | An element that gives off radiation, a form of atomic energy.
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| homologous | Body parts in different species that are similar in origin and structure.
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| vestigial structure | A body part that is reduced in size and has no obvious use.
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| embryology | The study of the development of embryos, which are the earliest stages of an organism's development.
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| primate | The group of mammals to which monkeys, apes, and humans belong and which share several characteristics, such as opposable thumbs.
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| homind | The earliest humanlike primates; ate both meat and veggies and walked upright on two feet.
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| Homo sapiens | Our own species, a homind primate mammal; evolved 300,000 years ago.
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| extinction | The dying out of an entire species.
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| endangered species | A species with so few individuals left that it is in danger of extinction.
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