Mollusks have a coelom and a complete digestive system. ... Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water. Mollusks have a circulatory system with one or two hearts that pump blood. What...
As opposed to a closed system, arthropods– including insects, crustaceans, and most mollusks– have an'open' circulatory system. Which of the following is the characteristic feature of Arthropoda? The important characteristics of arthropoda include: Theypossess an exoskeleton. They have jointed appenda...
Echiuroids, sipunculids, and tentaculites, except brachiopods, do not have a heart. Brachiopods have one heart located near the stomach and connected to the aorta and one to three pairs of additional hearts located on the major arteries. In most mollusks the heart is well developed. Located...
Rays are closely related to sharks, but they have adopted a very different lifestyle. Most rays are flattened bottom dwellers that crush mollusks and crustaceans in their jaws. The enlarged pectoral fins of rays are used like wings to propel the animal through the water. ...
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Crabs don't have a heart. They have an open circulatory system . ... It is called an open circulatory system because the blood doesn't flow in a closed loop like it does in a human's closed circulatory system – which has a heart, arteries and veins to return the blood to the hear...