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Extinction



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4 A diagram that shows how scientists think different groups in organisms are related.
6 Body parts that are structurally similar in related species.
7 A well-tested concept that explains a wide range of observations.
8 The preserved remains or traces of an organism that lived in the past.
9 A process in which individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same species.
10 A scientist who studies fossils.
12 The comparison of the structures of different organisms.
13 The process of grouping things based on their similarities.
14 The gradual change in a species over time.
15 The struggle among organisms, both of the same and of different species, for food, space, and other vital requirements.
1 A behavior or physical characteristic that allows an organism to survive or reproduce in its enviroment.
2 The disappearance of all members of a species from Earth.
3 A group of organisms that are physically similar and can mate with each each other and produce offspring that can also mate and reproduce.
4 The system for naming organisms in which each organism is given a unique, two-part scientific name.
5 A classification grouping that consists of a number of similar, closely related species.
11 Any differences between individuals of the same species.
 
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