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

Casteel Invertebrate


Invertebrates do not have a ____________________. backbone
A little over 95% of animals are __________________. invertebrates
The _________________ invertebrates are sponges, corals, and jellyfish. simplest
_____________ have a shell that protects their soft bodies. Mollusks
Squids have an __________________ shell. internal
An _____________________ has no shell. octopus
Examples of ______________ are sea urchins and sea stars. echinoderms
Echinoderms live in _____________ water. salt
Echinoderms have body parts in multiples of ______. five
__________________ have body parts in segments. Arthropods
Arthropods include _______________, spiders, and insects. crustaceans
Crustaceans have a hard __________________ shell. exterior
Crustaceans have five ____________ of jointed limbs. pairs
Spiders have __________ body segments. two
Spiders have _____________ legs. eight
_______________ have antennae, jaws, and three body segments. Insects
There are more insect species on ____________ than all other animal species combined. Earth
Created by: lkcasteel