Mollusks have 3-chambered heat. They have gills and they have 1-way digestion.
Other characteristics of mollusks are: 1) Bilaterally symmetrical 2) Body has more than two cell layers, tissues and organs 3) body without cavity 4) body monomeric and highly variable in form, may possess a dorsal or lateral shells of protein and calcarous spicules. 5) has a nervous system with a circum-oesophagal ring, ganglia and paired nerve chords 6) has an open circulatory system with heart and aorta 7) has a pair of kidneys 8) reproduction normally sexual and gonochoristic 9) feed a wide range of material 10) live in most environment
Protect. The immune system protects the body from diseases and harmful pathogens. The skeletal system keeps you upright and supports you with help from the muscles.
