My Crossword Maker Logo
Powered by BrightSprout
Save Status:
or to save your progress. The page will not refresh.
Controls:
SPACEBAR SWITCHES TYPING DIRECTION
Answer Key:
Edit a Copy:
Make Your Own:
Crossword Word Search Worksheet
Rate This Puzzle:
Log in or sign up to rate this puzzle.

Evolution

Across
A technique used to determine the actual age of a fossil based on the amount of a radioactive element.
Structures that remain in organisms that were necessary at one time, but no longer so.
A diagram that shows how species are related.
English natural scientist who formulated the Theory of Evoluton
The preserved remains or traces of an organism that lived in the past.
Body parts that are structurally similar in related species and that provide evidence for a common ancestor.
A type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part.
Any differences between individuals of the same species
A well tested concept that explains a wide range of observations.
The disappearance of all members of a species from Earth.
Down
THe theory that species evolve during short periods of rapid change.
A fossil formed when minerals replace all or part of an organism.
The gradual change in a species over time.
The millions of fossils scientists have collected
A technique used to determine which of two fossils is older. It is not exact.
A process by which individuals that are better adapted to their environments are more likely to survive and reproduce than others of the same species.
A group of organisms that are physically similar and cna mate with each other and produce offspring that can also mate and reproduce.
A characteristic, a behavior, or inherited trait that makes a species able to survive and reproduce.
A type of fossil that forms when a mold becomes filled in with minerals that then harden.