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McGraw Hill Ch. 6 (7th Grade)

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Fossil Record
This is made up of all the fossils ever discovered on Earth.
Mold
The impression of an organism in a rock.
Cast
A fossil copy of an organism in a rock.
Trace Fossil
The preserved evidence of the activity of an organism.
Geologic Time Scale
A chart that divides Earth's History into different time units.
Extinction
This occurs when the last individual organism of a species dies.
Biological Evolution
The change over time in populations of related organisms.
Naturalist
A person who studies plants and animals by observing them.
Variation
A slight difference in an inherited trait of individual members of a species.
Natural Selection
The process by which populations of organisms with variations that help them survive in their environments live longer, compete better and reproduce more than those that do not have the variation.
Adaption
The inherited trait that increases an organism's chance of surviving and reproducing in its environment.
Camouflage
The adaptation that enables a species to blend in with its environment.
Mimicry
The resemblance of one species to another.
Selective Breeding
The breeding or organisms for desired characteristics.
Comparative Anatomy
The study of similarities and differences among structures of living species.
Homologous Structure
Body parts of organisms that are similar in structure and position but different in function. These structures suggest an evolutionary relationship.
Analogous Structure
Body parts that perform a similar function but differ in structure.
Vestigial Structure
Body parts that have lost their original function through evolution.
Embryology
The science of the development of embryos from fertilization to birth.