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Science: 1 sem

Science: Chapter 6 definitions- Evolution

species A group of organisms whose members sucessfully reproduce among themselves.
evolution The changes that occur over time in hereditary features.
natural selection Darwin's theory says that organisims best adapted to their enviromen are more likely to survive and pass their traits to offspring.
variation The occurance 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 continious 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.
fossils The 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 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 structure A body part that is reduced in size and 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 opposable thumbs.
homind The earliest humanlike primates; ate both meat and veggies and walked upright on two feet.
Homo sapiens Our own species, a homind 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: Backwrdfshy