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Change Over Time

Name____________________________________
Date____________Per.__________Row________
Life Science Textbook   Chapter 6 pages 172-197
Across
A group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce.
A diagram that shows how scientists think different groups of organisms are related.
Well-tested concept that explains a wide range of observations.
A behavior or physical characteristic that allows an organism to survive or reproduce in its environment.
An unstable element that breaks down into a different element.
The preserved remains or traces of an organism that lived in the past.
Body parts that are structurally similar in related species and that provide evidence for a common ancestor.
A fossil formed when minerals replace all or part of the organism.
A type of fossil that forms when a mold becomes filled in with minerals that then harden.
Any difference between individuals of the same species.
The gradual change in a species over time.
Down
The theory that species evolve during short periods of rapid change.
The preserved remains or traces of an organism that lived in the past.
A technique used to determine which of two fossils is older.
A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains.
A process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same species.
The time it takes for half of the atoms in a radioactive element to decay.
The theory that evolution occurs slowly and steadily.
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
The disappearance of all members of a species from Earth.