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Evolutionary History 1

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