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Science vocab.

TermDefinition
Natural Selection The process by which individuals are better adapted to their environment and are more likly to survive and reproduce.
Variation Any difference between individuals of the same species.
Half-Life The time it takes for half of the atoms in a sample to decay.
Scientific Theory A well tested concept that explains a wide range of observation.
Puncthated equilioria The theory that species evolve quickly during short bursts of time.
Fossil record Documentation of the millions of fossils scientists have collected over time.
Radioactive elements Unstable elements that decay or break down into different elements.
Homologous Structures Similar structures that related species have inherited from common ancestors.
Mold A hollow space left where the fossil has decayed or dissolved.
Relative dating A process comparing the age of two fossils by their placement in teh layers of sedimentery rock layers.
Evolution Gradual changes in a species over time.
Petrified fossils Fossils that are buried in sediments and acually changed to rock.
Adaption A trait that helps an organism survive and reproduce.
Gradulism The theory that evolution occurs slowly but steadly.
Branching Tree A diagram that shows how scientists think diffenrent groups of organisms are related.
Radioactive dating A process that tests the radioactive materials within a fossil to tell its acual age (also known as absolute dating).
Fossil Preserved remains of an organism that lived in the past.
Extinction When no member of the species is still alive.
Cast A copy of the shape of the organism its made from.
Competetion This is a factor in Natural Selection as organisms attempt to survive using the same limited resources (food, shelter, mates...).
Homologous Sturctures evidence that related species had a common ancestor because Of the way their bodies are anatomically constructed in similar ways. (dolphin flipper, bird wing, dog leg)
OverProduction This factor in Natural Selection happens when there are more offspringthat can possibly survive on the given resources.
Species A group of organisms that can mate together and produce fertile offspring.
Created by: Loubear12