In an earthworm's _________,fluid-filled internal chambers receive coordinated forces of circular and longitudinal muscle contraction to effect movement.

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A hydrostatic skeleton is a fluid-filled internal cavity that provides support and resistance to movement through coordinated contractions of circular and longitudinal muscles. This type of skeletal system is common in invertebrates such as earthworms, jellyfish, and cnidarians. The other choices listed (appendicular skeleton, endoskeleton, axial skeleton, and exoskeleton) are types of skeletal systems found in vertebrates.

In an Earthworm's _________,Fluid-Filled Internal Chambers Receive Coordinated Forces of Circular