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Chapter 6
evolution
17
Science
8th Grade
10/20/2009

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Term
Species
Definition
group of organisms that share similar characteristics and can reproduce among themselves.
Term
Evolution
Definition
change in inherited characteristics over time.
Term
Natural Selections
Definition
a process in which organisms with traits best suited to there environment are more likely to survive and reproduce.
Term
Variation
Definition
inherited trait that makes an individual different from other members of the same species and result from a mutation in the organisms genes.
Term
Adaptation
Definition
the action or process of adapting or being adapted.
Term
Gradualism
Definition
a policy of gradual reform rather than sudden change or revolution.
Term
Punctuated Equilibrium
Definition
the hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change.
Term
Embryology
Definition
the branch of biology and medicine concerned with the study of embryos and their development.
Term
Hominid
Definition
a primate of a family ( Hominidae) that includes humans and their fossil ancestors.
Term
Homo sapiens
Definition
the primate species to which modern humans belong; humans regarded as a species.
Term
Fossils
Definition
remaining of a animal.
Term
Sedimentary
Definition
that has formed from sediment deposited by water or air.
Term
Primates
Definition
the chief bishop or archbishop of a province
Term
Vestigial structure
Definition
such as the human appendix.
Term
Relative Dating
Definition
one way to find the approximent age of fossils.
Term
Radioactive Element
Definition
emitting or relating to the emission of ionizing radiation or particles
Term
Homologous
Definition
emitting or relating to the emission of ionizing radiation or particles.
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