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.
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
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

Unit 1

Evolution

TermDefinition
cell The smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm
stimulus Anything that causes a reaction or change in an organism or any part of an organism
homeostasis The maintenance of a constant internal state in a changing environment
DNA Deoxyribonucleic acid, a molecule that is present in all living cells and that contains the information that determines the traits a living thing inherits and needs to live
sexual reproduction Reproduction in which the sex cells from 2 parents unite to produce offspring that share traits from both parents
asexual reproduction Reproduction that does not involve the union of sex cells and in which one parent produces offspring that are genetically identical to the parent
theory of evolution The process by which inherited characteristics within a population change over generations - this leads to the rise of new species
selective breeding The human practice of breeding animals or plants that have certain desired traits; also called artificial selection
natural selection The process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well-adapted individuals
variation The occurrence of hereditary or non-hereditary differences between different individuals of a population
mutation A change in the nucleotide base sequence of a gene or DNA molecule
adaptation A characteristic that improves an individual’s ability to survive and reproduce in a particular environment
extinction The death of every member of a species
fossil The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
fossil record The history of life in the geologic past as indicated by the traces or remains of living things
Created by: jessica.watson