Transcript Darwin`s Theory

Chapter 5
“CHANGES OVER
TIME”
A group of similar organisms that
can mate with each other and
produce offspring?
SPECIES
The preserved remains or traces
of an organism that lived in the
past?
FOSSIL
A trait that helps an organism
survive and reproduce?
ADAPTATION
The gradual change in a species
over time?
EVOLUTION
A well-tested concept that
explains a wide range of
observations?
SCIENTIFIC
THEORY
The process by which individuals
that are better adapted to their
environment are more likely to
survive and reproduce?
NATURAL
SELECTION
Any difference between
individuals of the same species?
VARIATON
Body parts that are structurally
similar in related species?
HOMOLOGOUS
STRUCTURES
A diagram that shows how
scientists think different groups
of organisms are related?
BRANCHING TREE
*A fossil formed when minerals
replace all or part of an
organism?
PETRIFIED FOSSIL
*A type of fossil formed when a
shell or other hard part of an
organism dissolves, leaving an
empty space in the shape of the
part?
MOLD
*A type of fossil that forms when
a mold becomes filled in with
minerals that then harden?
CAST
*A technique used to determine
which of two fossils is older?
RELATIVE DATING
*A technique used to determine the
actual age of a fossil on the basis of
the amount of radioactive element it
contains?
RADIOACTIVE
DATING
*An unstable element that breaks
down into a different element?
RADIOACTIVE
ELEMENT
The time it takes for half of the
atoms in a radioactive element
to break down?
HALF-LIFE
The millions of fossils that
scientists have collected?
FOSSIL RECORD
Term used to indicate a species
that no longer exists?
EXTINCT
The theory the evolution occurs
slowly but steadily?
GRADUALISM