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
The time between
Lowers genetic variation for populations and species
Also keep male and females cells from uniting.
Organisms with adaptions
Occurs when two similar reproducing beings evolve
Favors one extreme or the others.
Differences in organisms within same species.
Tiny per-cells with selectivity permeable membranes.
Change over time
Explosions that left ash and causing extinction
Keep male and female sex cells from uniting
Ability to breed successfully.
Became a permanent structure of a larger one
Down
An organism that has died out
Produce viable offspring
Because more offspring are born that can survive.
Eras are subdivided into periods.
Decrease in size due to a environmental event.
The set of all genes for a species
Fossils of organisms that only survived for a short period of time
A change in the code of an organisms DNA