The Water Vascular System of Echinoderms Carries Out Many Functions

question 19

Multiple Choice

The water vascular system of echinoderms carries out many functions that are distributed through multiple systems in other animals.Which of the statements below are valid comparisons between the functions of the water vascular system and similar functions in arthropods? Check all that apply.

• A) Gas exchange in echinoderms often occurs via diffusion of gases across tube feet.In arthropods there are tracheal systems or gills that provide for gas exchange.
• B) The water vascular system is often a means of attachment and locomotion via tube feet of echinoderms.In arthropods,muscles interact with the jointed exoskeleton to produce movement.
• C) The water vascular system of echinoderms provides for the release of gametes for external fertilization.Arthropods have oviducts and sperm ducts for the release of gametes to the environment.
• D) The water vascular system has sensory function in virtually all echinoderms.In some echinoderms,it also may be involved with suspension feeding.In arthropods,the exoskeleton is modified for sensory perception and feeding usually involves specialized mouthparts and other modified appendages.

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