invertebrateClosedcirculatorysystemhostsystemlarvatissuebodystructurescavengerBilateralSymmetryjellyfishsexualreproductiontissueroundwormpolypbodyradialsymmetryCnidariansAsexualReproductionCellparasiteorganAdaptationFree-livingorganismsvertebrateshelterinvertebrateClosedcirculatorysystemhostsystemlarvatissuebodystructurescavengerBilateralSymmetryjellyfishsexualreproductiontissueroundwormpolypbodyradialsymmetryCnidariansAsexualReproductionCellparasiteorganAdaptationFree-livingorganismsvertebrateshelter