What type of skeletal system provides structural support and locomotion in the common earthworm (Lumbricus terrestris)?
Answer and explanation
Correct answer: A. hydrostatic skeleton consisting of pressurized fluid inside segmented coelomic compartments
- Step 1: Annelids possess a fluid-filled coelom divided into segments by septa. Step 2. Circular and longitudinal muscles in the body wall exert pressure against this incompressible coelomic fluid (hydrostatic skeleton) to create peristaltic crawling waves. Answer: hydrostatic skeleton consisting of pressurized fluid inside segmented coelomic compartments. Why not the others: Calcareous exoskeletons occur in mollusks/corals; cartilaginous endoskeletons in fish/vertebrates; spicules in sponges.
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