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Biology

Across
Evolution of one or more closely related species into different species; resulting from adaptations to different environmental conditions
Form of reproductive isolation in which two populations reproduce at different times
Study of distribution of organisms around the world
Same as divergent evolution
Diagram that shows evolutionary relationships among a group of organisms
Remnant of a structure that may have had an important function in a species ancestors, but has no clear function in the modern day species
The greater the similarity of amino acids, the closer the evolutionary relationship
Process by which two species evolve in response to changes in each other
Structures that are similar in different species of common ancestor but have a different function
Study of embryos and their development-evidence because they show common ancestry
The theory that evolution occurs slowly but steadily
The humorous bone in humans, cats, whales and bats are an example
Down
Species occur in the same area, but they occupy different habitats and rarely encounter each other
Pattern of evolution in which long stable periods are interrupted by brief periods of rapid change
Body parts that share a common function but not structure
Group of species that includes an ancestral species and all its decedents
Preserved remnant or impression of an organism that lived in the past
Fertilized egg