PHYLUM MOLLUSCA. WHAT IS A MOLLUSK? Why are animals that look and act so different grouped in the same phylum? It is because they share developmental patterns . Characteristics of Mollusk 1. mantle 2. mantle cavity 3. shell 4. true coelom 5. head, muscular foot, visceral cavity
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Why are animals that look and act so different grouped in the same phylum? It is because they share developmental patterns.
2. mantle cavity
4. true coelom
5. head, muscular foot, visceral cavity
6. systems: circulatory, respiratory, digestive, excretory, reproductive, and nerve impulses
external or internal shell.
Their name comes from the Latin word molluscus meaning soft.
OPEN CIRCULATORY SYSTEM
In open circulatory systems, the blood is not always contained in vessels. There is a simple heart and a few arteries but there are no veins. Blood leaves the heart and bathes the internal organs and travels through the body in open spaces called sinuses. These sinuses lead the blood to the gills where oxygen and carbon dioxide are exchanged(diffusion).
All animals must remove waste products An open circulatory system will work well for slow
moving animals. Why is an open circulatory system not adequate for fast-moving animal