Transcript Change Over Time

Change Over Time
Vocabulary
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Evolution
Natural selection
Adaptation
Scientific theory
Variation
Fossil
Half-life
Species
Punctuated equilibrium
Relative dating
Gradualism
Absolute dating
Evolution
-a gradual change in a
species over time
Natural selection
-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
Polar Bear’s Fur
Adaptation
-a characteristic that helps an
organism survive in its
environment or reproduce
Giraffe's long
neck
Scientific theory
-a well-tested concept that
explains a wide range of
observations
Variation
-any difference
between individuals
of the same species
ALL Different
types of Men
Fossil
-the preserved
remains or traces of
an organism that lived
in the past
Half-life
-the time it takes for half of the
atoms of a radioactive
element to decay
½ decay
Species
-a group of similar organisms
whose members can mate with
one another and produce fertile
offspring
Punctuated equilibrium
-the theory that species
evolve during short periods
of rapid change
Relative dating
-a technique used to
determine which of
two fossils is older
Gradualism
-the theory that
evolution occurs
slowly but steadily
Absolute dating
-a technique used to
determine the actual age of a
fossil
Age