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Chapter 6

lesson 1 and 2

QuestionAnswer
a group of similar organisms that can mate with each other and produce fertile offspring species
the preserved remains or traces of an organism that lived in the past fossil
a trait that helps and organism survive and reproduce adaptation
a gradual change in a species over time evolution
a well-tested concept that explains a wide range of observations theory
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 natural selection
any difference between individuals of the same species variation
similar structures that related species have inherited from a common ancestor homologous structures
a diagram that shows how scientists think different groups of organisms are related branching tree
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