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Vocabulary

The Changes Over Time

TermDefinition
Natural Selection The process by which individuals are better adapted to their environment and are more likely to reproduce
Variations 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 observations
Punctuated Equilibria The theory that species evolve quickly during short bursts of time
Fossil Record Documentation of the million 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 of dissolved.
Relative Dating A process comparing the age of two fossils by their placemnt in the layers of sedimentary rock layers
Evolution Gradual Changes in a species over time
Petrified Fossils Fossils that are buried in sediments and actually changed to rock
Adaptions A trait that helps organisms survive and reproduce
Gradualism The theory that evolution occurs slowly but steadly
Branching tree A diagram that shows how scientists think different groups of organisms are related
Radioactive dating A process that tests the radioactive materials within a fossil to tell its actual age
Fossils Preserved remains of an organism that lived in the past
Extinct When no member of the species is still alive
Mold Cast A copy of the shape of the organism that made
Competition This is the factor in Natural Selection as organisms attempt to survive using the same limited resources
Homologous Structures Evidence that related species had a common ancestor because of the way their bodies are anatomically constructed in similar ways
Over Production This factor in Natural Selection happens when there are no more offspring than can possibly survive on the given resources.
Species A group of organisms that can mate together and produce fertile offspring.
Created by: Tiny_Rylie04
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