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

Animals Chapter 4

Lesson 1, 2, 3, & 4

Homeostasis The condition in which an organism internal environment is kept stable in spite of changes in the external environment
Adaptation An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment
Vertebrate An animal with a backbone
Invertebrate An animal without a backbone
Tissue A group of similar cells that perform a specific function
Organ A body structure that is composed of different kinds of tissues that work together
Radial Symmetry A body plan in which any number of imaginary lines that all pass through a central point divide the animal into two mirror images
Bilateral Symmetry A body plan in which a single imaginary line divides the body into left and right sides that are mirror images of each other
Cnidarian A radially symmetrical invertebrates 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
Echinoderm A radically symmetrical marine invertebrate that has an internal skeleton and a system of fluid-filled tubes
Endoskelelton An internal skeleton; structural support system within the body of an animal
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 cord
Vertebra The bones that make up the backbone of an organism. In humans, one of 26 bones that make up the backbone
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: FDMcCormick