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Arthropod & Echinoderm Puzzle

Across
Hard outer shell
Animals that lacks a backbone
Shedding of old exoskeleton
The ability to bend at joints
This type of muscle allow quick, strong, and rapid movement
Endoskeleton of echinoderms are made up of ___ carbonate
Down
A ___-vascular system is used instead of circulatory, respiratory and excretory systems in echinoderms
Pincers commonly found at the base of tube feet in sea stars
Form of protection where internal organs are ejected from the body
Most successful animal phylum
Type of symmetry based around a central point
Bottom dwellers