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Evolution

Species A group of organisms whose members successfully reproduce among themselves.
Evolution Changes that occur over time in the hereditary features of a species of organisms.
Natural selection Darwin’s theory of evolution; states that organisms best adapted to their environment are more likely to survive and pass their traits to their offspring.
Variation The occurrence of an inherited trait that makes an individual different from other members of the same species.
Gradualism A model of evolution, showing a steady, slow, and continuous change of one species into new species.
Punctuated equilibrium A model of evolution; showing the rapid change of a species caused by the mutation of just a few genes.
Fossil Remains of life from an earlier time.
Sedimentary rock A type of rock formed when fine particles like mud and sand settle out of water and become cemented together.
Relative dating Estimating the age of a fossil by comparing it to younger fossils in the rock layers above and to older fossils in the rock layers below.
Radioactive element An element that gives off radiation; a form of atomic energy.
Homologous Body parts in different species that are similar in origin and structure.
Vestigial structures A body part that is reduced in size and that has no obvious use.
Embryology The study of the development of embryos, which are the earliest stages of an organism's development
Primate The group of mammals to which monkeys, apes and humans belong and which share several characteristics, such as an opposable thumb.
Hominid Earliest humanlike primates; ate both meat and vegetables and walked upright on two feet.
Homo sapiens Our own species, a hominid primate mammal; evolved 300,000 years ago.
Extinction The dying out of an entire species.
Endangered species A species with so few individuals left that it is in danger of extinction.
Created by: brsa1212
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