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.
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


Lessons 3 and 4

Cnidarian A radially symmetrical invertebrate that uses stinging cells to capture food and defend itself.
Mollusk An invertebrate with a soft, unsegmented body; most are protected by a hard outer shell.
Arthropod An invertebrate that has an external skeleton, a segmented body, and jointed appendages.
Exoskeleton External skeleton; a tough, waterproof outer covering that protects, supports, and helps prevent evaporation of water from the body of many invertebrates.
endoskeleton An internal body skeleton; structural support system within the body of an animal.
Echinoderm A radially symmetrical marine invertebrate that has an internal skeleton and a system of fluid-filled tubes.
Chordate An animal that has a notochord, a nerve cord, and throat pouches at some point in its life.
Notochord A flexible rod that supports a chordate's back just below the nerve chord.
Vertebra The bones that make up the backbone of an organism
Ectotherm An animal whose body temperature is determined by the temperature of its environment.
Endotherm An animal whose body temperature is regulated by the internal heat the animal produces.
Created by: cwright6015