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life science ch 5 (8th grade)
chapter 5 "changes over time" - darwin fossils evolution
20
Science
8th Grade
10/25/2012

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Term
SPECIES
Definition

A GROUP OF SIMILAR ORGANISMS THAT CAN MATE WITH 

 

AND PRODUCE FERTILE OFFSPRING

Term
ADAPTATION
Definition
A TRAIT THAT HELPS AN ORGANISM SURVIVE
Term
EVOLUTION
Definition
THE GRADUAL CHANGE IN A SPECIES OVER TIME
Term
SCIENTIFIC THEORY
Definition
A WELL TESTED CONCEPT THAT EXPLAINS A WIDE RANGE OF OBSERVATIONS
Term
FOSSIL
Definition
THE PRESERVED REMAINS OR TRACES OF AN ORGANISM THAT LIVED IN THE PAST
Term
HOW FOSSILS ARE FORMED
Definition
MOST FOSSILS ARE FORMED WHEN ORGANISMS THAT DIE BECOME BURIED IN SEDIMENTS
Term
SEDIMENTS
Definition
PARTICLES OF SOIL AND ROCK
Term
PETRIFIED FOSSILS
Definition
A FOSSIL IN WHICH MINERALS REPLACE ALL OR PART OF AN ORGANISM
Term
MOLD
Definition
A HOLLOW SPACE IN SEDIMENT IN THE SHAPE OF AN ORGANISM OR PART OF AN ORGANISM
Term
CAST
Definition
A COPY OF THE SHAPE OF THE ORGANISM THAT MADE A MOLD
Term
WAYS TO DETERMINE A FOSSIL'S AGE
Definition
RELATIVE DATING AND ABSOLUTE DATING
Term
RELATIVE DATING
Definition
A TECHNIQUE USED TO DETERMINE WHICH OF TWO FOSSILS IS OLDER
Term
ABSOLUTE DATING
Definition
A TECHNIQUE USED TO DETERMINE THE AGE OF A FOSSIL
Term
RADIOACTIVE ELEMENTS
Definition
UNSTABLE ELEMENTS THAT DECAY OR BREAK DOWN INTO DIFFERENT ELEMENTS
Term
HALF LIFE
Definition
THE TIME IT TAKES FOR HALF OF THE ATOMS OF A RADIOACTIVE ELEMENT TO DECAY
Term
FOSIL RECORD
Definition
THE MILLIONS OF FOSSILS THAT SCIENTISTS HAVE COLLECTED
Term
EXTINCT
Definition
A SPECIES THAT DOES NOT HAVE ANY LIVING MEMBERS
Term
GRADUALISM
Definition
THE THEORY THAT STATES THAT EVOLUTION OCCURS SLOWLY BUT STEADILY
Term
PUNCTUATED EQUILIBRIA
Definition
THE THEORY THAT SPECIES EVOLVE DURING SHORT PERIODS OF RAPID CHANGE
Term
HOMOLOGOUS STRUCTURES
Definition
BODY PARTS THAT ARE STRUCTURALLY SIMILAR IN RELATED SPECIES
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