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Evolutionary History 1

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Across
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an organism's arm, leg, or wing
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having died out completely and no longer alive anywhere on Earth
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evidence of life from the past, such as fossilized bones, footprints, or leaf prints
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a trait that makes it more likely that an individual will survive in a specific environment
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sharing a common ancestor population
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a scientist who studies fossils in order to understand the ancient history of life on Earth
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a related organism from a previous generation
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a graph that uses bars to show how characteristics or values are distributed within a group
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the process by which one population evolves into two or more different species
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a more recent species that evolved from an ancestor population
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the process by which the distribution of traits in a population changes over many generations
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a group of individuals born and living at about the same time
Down
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a random change to a gene that sometimes results in a new trait
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a specific characteristic of an individual organism
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to receive genes from a parent
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the very long time that spans the history of Earth, from the very first cellular life to the present
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a body structure in two or more species that features the same parts (for example, the same bones)
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everything (living and nonliving) that surrounds an organism
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a part of an organism (for example, one or more bones)
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living things, such as plants, animals, and bacteria
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to classify based on scientific examination
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a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
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when something stays mostly the same over time
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a group of the same type of organism living in the same area
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the process by which species adapt to environmental changes over a very long time