Transform Boundaries The final type of boundary is one where the two plates slide against each other in a sideways motion. These boundaries between plates is referred to as transform boundaries.
The three regions of the body of the Mollusk are the head-foot, the visceral mass, and the mantle-shell.
Many mollusks have their mantle produce a calcium carbonate external shell and their gill extracts oxygen from the water and disposes waste. All species of the phylum Mollusca have a complete digestive tract that starts from the mouth to the anus.Many have a feeding structure, the radula, mostly composed of chitin.he appendages of a starfish are called arms. Starfish typically  have five arms (also called rays) but depending on the species they  can have as few as three or as many as â¦ fifty.