Unit #3 Evolution Flashcard

Species
A group of similar organisms that can mate with each other and produce fertile offspring
Adaptation
A trait that can help an organism survive
Evolution
The gradual change in a species over time
Scientific Theory
A well-tested concept that explains a wide range of observations
Natural Selection
The process by which individuals are better adapted to their environment and are more likely to survive and reproduce
Variation
Any difference between individuals of the same species
Fossil
The preserved remains or traces of an organism that lived in the past
Sedimentary Rock
Rock formed when sediment hardens over millions of years
Mold

 an empty space in a sediment in the shape of an organism or part of an organism

Cast
When a mold becomes filled in with harden minerals
Fossil Record
The millions of fossils that scientists have collected
Extinct
A species that have no living members.
Homologous Structures
Similar structures.
Branching Tree
A diagram that shows how scientists think different groups of organisms are related.
petrified fossil
remains that become buried in sediments and are actually changed into rocks

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