Compared to the control (red line), in which both sea urchins and limpets are present, removing limpets alone (blue line) did not have much effect. this might suggest that limpets have little effect on seaweed distribution. however, seaweed cover increased much more when both urchins and limpets were removed (purple line) than when only urchins were removed (green line). how might you explain this result? how might you explain this result? when only urchins were removed, limpets increased in abundance and reduced seaweed cover. both limpets and urchins eat seaweed, so removing either species has the same effect on seaweed cover. both limpets and urchins eat seaweed, so both species have to be removed in order for seaweed cover to increase. if only limpets are removed, more time is needed for seaweed cover to increase.