a trait that makes it more likely that an individual will survive in a specific environment
a related organism from a previous generation
a part of an organism (for example, one or more bones)
an older population from which two or more newer species descended
a more recent species that evolved from an ancestor population
everything (living and nonliving) that surrounds an organism
the process by which species adapt to environmental changes over a very long time
having died out completely and no longer alive anywhere on Earth
a group of individuals born and living at about the same time
a random change to a gene that sometimes results in a new trait
the process by which the distribution of traits in a population changes over many generations
living things, such as plants, animals, and bacteria
a scientist who studies fossils in order to understand the ancient history of life on Earth
a group of the same type of organism living in the same area
sharing a common ancestor population
a body structure in two or more species that features the same parts (for example, the same bones)
the process by which one population evolves into two or more different species
a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
evidence of life from the past, such as fossilized bones, footprints, or leaf prints
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