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Chapt 6: Changes over time
Hutchison Exam Sp 07
10
Science
7th Grade
05/16/2007

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Term
fossils
Definition
pg. 173: a preserved remain or traces of an organism that lived in the past.
Term
adaptation
Definition
p. 175: a trait that helps an organism survive and reproduce, such as the the bright colors found on flowers to attract pollinating insects.
Term
Charles Darwin
Definition
a naturalist who observed living things on the Galapagos Islands in the 1830's. It developed the theory of evolution by natural selection
Term
evolution
Definition
p. 176 The gradual change in a species over time to better adapt to new conditions.
Term
scientific theory
Definition
p. 176: a well-tested concept that explains a wide range of observations.
Term
natural selection
Definition
p. 177: the process by which individuals that are better adapted to their environments are more likely to survive and reproduce than other members of the same species.
Term
selective breeding
Definition
p. 176: controlling the offspring of an organism by repeatedly only allowing those organisms with the traits you want to control to mate, such as Darwin and his pigeons.
Term
Darwin's three important observations
Definition
p. 173: 1. diversity of living things--2. remains of ancient organisms--3. characteristics of organisms on the Galapagos Islands.
Term
variation
Definition
p. 177: members of a species differ from on another in many of their traits. Difference between individuals of the same species are called variations, such as a tabby cat versus a persian cat.
Term
How does selection effect evolution?
Definition
p. 178: Darwin proposed that, over a long time, natural selection can lead to change. Helpful variations may gradually accumulate in a species while unfavorable ones may disappear.
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