EVOLUTION CROSSWORD

What is the process called where organisms better adapted to their environment tend to survive and produce more offspring?
A type of fossil that is formed when a shell or other hard part of an organism dissolves, leaving an empty space in the sea[e of that part.
A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
A fossil formed when minerals replace all or part of an organism.
A term used to refer to the total number of fossils that scientists have collected
An unstable element that breaks down in to a different element.
The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
The time taken for the radioactivity of a specified atoms to fall to half its original value.
A technique used to determine which of two fossils is older based on the layer of rock in which it was found.
Structures derived from a common ancestor or same evolutionary or developmental origin.
When no member of a species is no longer in existence.
A change by which an organism or species becomes better suited to its environment.
Any method used to determine the age of a fossil based on the amount of the radioactive element that it contains.
The change in the heritable charateristics of biological populations over successive generations.
The theory that evolution occurs slowly but steadily
The theory that species evolve during short periods of rapid change.