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A change in an organism that improves its ability, and the ability of its offspring, to survive in an environment.
The molecule that encodes genetic information. It is shaped like a double helix held together by bonds between base pairs.
A representation of how a specific taxonomic group evolved new species over time. All trees are hypotheses, and are based on comparison of living species, fossils, and genetic data.
An evolutionary mechanism in which genes and traits in small populations increase in abundance over generations by chance, not because they impact an individual's ability to survive.
A member of the family of primates that includes humans, their ancestors, and close relatives.
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