Question

question 3 (4 points) listen list and describe two features that differentiate mollusca and echinodermata.

Explanation:

1. Body Symmetry: Mollusca have bilateral symmetry (body can be split into two mirror-image halves along one plane), while adult Echinodermata have pentaradial symmetry (body arranged around a central axis, typically with 5 equal parts).
2. Water Vascular System: Echinodermata possess a unique water vascular system (a network of fluid-filled tubes used for movement, feeding, and respiration), which is entirely absent in Mollusca; mollusks use structures like a muscular foot for locomotion instead.

Answer:

1. Body Symmetry: Mollusca exhibit bilateral symmetry, while adult Echinodermata have pentaradial symmetry.
2. Unique Organ System: Echinodermata have a specialized water vascular system, a feature not present in Mollusca.