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crossword puzzle of Mr. K's aspirations

Across
A group of living things that are so closely related that they can breed with one another and produce offspring that can breed as well.
When a species no longer exists
Changes over time that occur in the traits of a species.
Producing more offspring than needed to survive, to insure the survival of the species
A characteristic,a behavior, or any inherited trait that gives an organism an advantage.
Darwin's theory which says that organisms best adapted to their environment are more likely to survive and pass on their traits to their offspring
A group of organisms of species that live in the same area.
Down
Segment of DNA that relates to a certain trait or function
The evolution of a new species from an existing species.
When mass amount of species die or become extinct in a short amount of time
Different forms of a trait in a species (example- gray and black moths)
An early form of an organism. which later leads to more species.
An organ that was fully developed and functional in an ancestor but unused in later generations.
Permanent change in DNA