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Science:5C "Changes Over Time"

Match the vocabulary word with it's definition.

AB
speciesa group of similar organisms whose members can mate with one another and produce fertile offspring
adaptationa characteristic that helps an organism survive in its environment or reproduce
evolutionthe gradual change in a species over time
scientific theorya well-tested concept that explains a wide range of observations
natural selectionthe process by which individuals that are better adapted to their environment are more likely to survive and reproduce that other members of the same species
variationany difference between individuals of the same species
fossilthe preserved remains or traces of an organism that lived in the past
sedimentary rocka type of rock that forms when particles from other rocks or the remains of plants and animals are presses and cemented together
petrified rocka fossil in which minerals replace all or part of an organsim
molda fossil formed when an organsim buried in sediment dissolves, leaving a hollow area
casta fossil that is a copy or an organism's shape, formed when minerals seep into a mold
relative datinga technique used to determine which of two fossils is older
absolute datinga technique used to determine the actual age of a fossil
radioactive elementan unstable particle that breaks down into a different element
half-lifethe time it takes for half of the atoms of a radioactive element to decay
fossil recordthe millions of fossils that scientists have collected
extincta species that does not have any living members
gradualismthe theory that evolution occurs slowly but steadily
punctualed equilibriathe theory that species evolve during short periods of rapid change
homologous structurebody parts that are structurally similar in related species; provide evidence that the structures were inherited from a common ancestor
branching treea diagram that shows how scientists think different groups of organisms are related

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