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Changes Over Time



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5 a technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains
8 a technique used to determine which of two fossils is older
9 a diagram that shows how scientists think different groups of organisms are related
10 the theory that species evolve during short periods of rapid change
11 a well-tested concept that explains a wide range of observations
12 term used to indicate a species that does not have any living members
13 an unstable element that breaks down into a different element
14 the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
17 a fossil formed when minerals replace all or part of an organism
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1 any difference between individuals of the same species
2 a type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part
3 a type of fossil that forms when a mold becomes filled in with minerals that then harden
4 body parts that are structurally similar in related species; provide evidence that the structures were inherited from a common ancestor
6 a trait that helps an organism survive and reproduce
7 the preserved remains or traces of an organism that lived in the past
15 the time it takes for half of the atoms in a radioactive element to break down
16 the theory that evolution occurs slowly but steadily
18 the gradual change in a species over time
19 a group of similar organisms that cna mate with each other and produce fertile offspring
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