Consists of the heart, the blood vessels, and the blood that circulates through them?
Circulatory system
Osteoclasts are overly active.
Most crustaceans are aquatic, or reside in water habitats.
Instead of vertebrae, crustaceans have a hard outer shell called an exoskeleton.
They also have segmented bodies, with appendages extending from each segment.
Here's a fun fact: crustaceans have single-chambered hearts and an open circulatory system.
1) help you identify an unknown organism
Answer: It absorbs food from the outside environment.
