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
Don't know
remaining cards
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:
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

7th Grade Ch 6

Adaptations Over Time

species a group of organisms that share similar characteristics and can reproduce among themselves to produce fertile offspring
evolution changes in inherited characteristics over time
natural selection when organisms best suited to their environment are more likely to survive and reproduce
variation an inherited trait that makes an individual different from other members of its species
adaptation any variation that makes an organism better suited to its environment
gradualism describes evolution as a slow, ongoing process by which one species changes to a new species
punctuated equilibrium rapid evolution comes about when the mutations of a few genes results in the appearance of a new species over a relatively short period of time
sedimentary rock formed when layers of sand, silt, clay, or mud are compacted and cemented together; fossils are found most often in this type of rock
radioactive element an element that gives off a steady amount of radiation as it slowly changes to a nonradioactive element
embryology the study of embryos and their development
homologous body parts that are similar in origin and structure
vestigial structures structures that don't seem to have a function, but provide evidence for evolution
primate organisms with opposable thumbs, binocular vision, and flexible shoulders; include humans, monkeys, and apes
hominid human-like primates that appeared 4-6 million years ago that were different from other primates
Homo sapiens early humans that likely evolved from Cro-Magnons
Created by: MsHollinger