Which of the following traits exist in mollusks? I. 3-chambered heart II. gills III. 1-way digestion IV. spinal cord
a. I, II, IV
c. I, III, IV
b. I, II, III
d. I, II, III, IV
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
