jenny accidentally drops her ring in to a graduated cylinder if the ring has a mass of 5 and the water level in the cylinder rises from 5ml to 7.5 ml, determine the density of the ring

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?