Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Changes Over Time

TermDefinition
Absolute Dating The technique that allows scientists to determine the actual age of a fossil.
Adaptation Any trait that helps an organism survive and reproduce.
Geographic Isolation When species are separated for a long time, a new species may form.
Species A group of similar organisms that can mate and produce fertile offspring.
Branching Tree A diagram that shows how different groups of organisms are related.
Variation Any difference between individuals of the same species.
Mold An empty space that forms when an organism buried in sediment dissolves.
Homologous Structure Similar structures that related species have inherited from a common ancestor.
Fossils The preserved remains or traces of organisms that lived in the past.
Relative Dating A technique used to determine which of two fossils is younger and which is older.
Evolution The gradual change in a species over time.
Natural Selection The process by which individuals that are better adapted to their environment are more likely to survive and reproduce.
Overproduction When a species creates more offspring than can possibly survive.
Petrified Fossil When minerals replace all or part of an organism.
Created by: sikkwl