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changes over time.

vocbulary for chapter 6

QuestionAnswer
The process by which indeviduals are better adapted to their enviorment and are more likely to survive and reproduce is called... Natural Selection
The difference between indeviduals of the same species is a... Variation
The time it takes for half of the atoms in a sample to decay is its... Half-Life
A well tested concept that explains a wide range of observations is a... scientific theory
The theory that species evolve quickly during a short period of time is... punctuated equilibria
Documentation of the millions of fossils scientists have collected over time is called... fossil record
Unstable elements that decay or break into different elements are... radioactive elements
Similar structures that related species have in herrited from common ancestors are called... homologous structures
A hollow space left where the fossil has decayed or dessolved is called... mold
A process comparing the age of two fossils by their placement in the layers of sedimentary rock layers is... relative dating
Gradual changes in a species over time is called... evolution
Fossils that are buried in sediments and acually changed into rocks are called... petrified fossils
A trait that helps an organism survive and reproduce is an... adaption
the theory that evolution occurs slowly but steadlt is... gradualism
A diagram that shows how scientists think different groups of an organisms are related is a... Branching Tree
A process that tests the radioactive meterials within a fossil to tell its actuall age also known as actual dating is called... radioactive dating
Preserved remains of an organism that lived in the past are... fossils
When no member of the species is still alive it is called... extinction
A copy of the shape of the organism that made is called a... cast
This is a factor in Natural Selection as organisms attempt to survive using the same limited resources... competition
Evidence that related species that have a common ancestor because of the way their bodies are anatomatically constructed in similar ways... homologous structures
This factor in Natural Selection happens when there are more offspring than can possibly survive on the given resorces... over production
a group of organisms that can mate together and produce fertile offsprings is called... species
Created by: Bwaddell
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