The Role of Extensor Muscles,absent in the Leg Joints of Many

question 22

Multiple Choice

The role of extensor muscles,absent in the leg joints of many spiders,has been replaced by

• A)fluid movements and pressure changes of the hydrostatic skeleton.
• B)strategically placed exoskeletal plates that store elastic energy when deformed.
• C)a system of chitinous self-locking and unlocking catches and levers.
• D)a system of autonomously controlled valves within the legs.

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