Coelom - the fluid-filled body cavity of an animal that contains the internal organs (as the heart, lungs, and kidneys), Vertebral column - The bones, muscles, tendons, and other tissues that reach from the base of the skull to the tailbone. Also called spine and back bone , cartilaginous fish - having the skeleton wholly or largely composed of cartilage, bioindicators - an organism or biological response that reveals the presence of the pollutants by the occurrence of typical symptoms or measurable responses.,

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