Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


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


Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

evolution   change over time  
fossil   preserved remains of an ancient organism  
fitness   ability of an individual to survive and reproduce in a specific environment  
adaptation   inherited characteristic that increases an organism's chance of survival  
natural selection   the process by which organisms with variations most suited to their environment survive and leave more offspring than others  
homologous structures   body structures that are similar in different species of common ancestry  
vestigial structures   body structures with little or no function  
biogeography   study of past and present distribution of organisms  
artificial selection   the process by which humans breed other animals and plants for particular traits.  
anaglogous structures   body structures that share a common function but not structure  


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
Created by: Mrs.Stichter