What organelle is ridged out layer of a plant cell

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.

Why do you suppose the structural polysaccharide cellulose does not contain branches?

Do fish feel pain? and if they do what pain