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Evolution
How life changes over time on Earth. Into it's present state
Theory of Evolution
The process in which organisms slowly change over long periods to form new and more .
Variation
Random genetic changes within a species.
Natural Selection
selects organisms based on survival traits.
Passing favorable traits to offspring.
becomes more fit over time.
Speciation
Formation of new due to changes.
Homologous Structures
Similar structures in related organisms.
Vestigial Structures
Structures with current function.
Phylogenetic Model
Tree-like pattern grouping organisms by traits.
Rock Layers
Earth's age supports evolution's time frame.
Intermediate Organisms
Fossils showing connections between species.
Embryological Development
Similarities in development among related species.
Structures
Similarities in proteins among related organisms.
Chromosome Appearance
Similarities in chromosome structures of related species.
DNA Nucleotide Sequences
Similar sequences in DNA of closely related organisms.
Survival of the Fittest
Only the strongest survive to reproduce.
Differential Reproduction
Survival leads to more offspring with traits.
Genetic Mutations
Random changes in DNA that create variation.
Physical Barriers
Geographic separations leading to speciation.
Mechanism of Change
Variations must exist for natural selection.
