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Complex Invertebrates

Complex Invertebrates - 

Mollusks - 
Share same body plan
They have muscular foot or tentacles, a fold of tissue called a mantle, and mass internal organs. 
Bilateral Symmetry
Snails, clams, and squids
Most have a shell
Specialized organs include heart, gills, breathing, nervous system

Enchinoderms
sea stars, sea urchins, sea cucumbers
have a harded skelton inside the body called Endoskelton

spines poke through their thin, bumpy skin
Radial Symmetry
Water pressure system helps them breathe, feed, and, move
Can cling to surfaces


 

Anthropods
Most numberous animal group on Earth
Spiders, crabs, insects
Small, light, and have hard skelton on outside called Exoskelton
Bolateral Symmetry
Segmented Body
Simple and efficient nervous system

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