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The History of Life
Section 14.1 Fossil Evidence of Change
Main Idea
Biology/Life Sciences 8.e Students know how to analyze fossil evidence
with regard to biological diversity, episodic speciation, and mass extinction.
Also covers: Biology/Life Sciences 8.g
Details
Skim Section 1 of the chapter. Write two questions that come to
mind from reading the headings and the illustration captions.
1. Accept all reasonable responses.
2.
extinction
New
Vocabulary
Cambrian explosion
era
fossil
Use your book or dictionary to define extinction.
the death of all individuals of a species
Use the terms in the left column to complete the paragraph below.
Scientists measure Earth’s geological and biological events using
the
geologic time scale
and
periods
, which is divided into
Cambrian explosion
. The
eras
is the name of a
period of rapid change during which the ancestors of most animal
groups emerged. A layer of soot found between rock layers
geologic time scale
half-life
worldwide, known as the
law of superposition
plate tectonics
period
describes Earth’s surface as
large plates that move over Earth’s thick, liquid interior. These plates
are made up of various types of rocks.
of rocks using
Paleontologists
are
fossils
. They determine the relative age
relative dating
, which compares the sequence of
scientists who study
paleontologist
, might indicate
that a large meteorite collided with Earth.
The theory of
K-T boundary
K-T boundary
rock layers. The
law of superposition
states that younger rock
layers are deposited on top of older rock layers. Another method of
plate tectonics
radiometric dating
determining the age of rocks is
142
The History of Life
, which
measures the decay of radioactive isotopes. The rate of decay can
be measured using
relative dating
radiometric dating
half-lives
, the amount of time required
for half of a radioactive isotope to decay.
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Review
Vocabulary