Which characteristics does mercury and mars share

Rocky surfaces is the characteristic that both Mercury and Mars share. Mercury has a solid surface that is covered with craters and the surface of Mars is rocky and covered with canyons, volcanoes and craters all over it.

Hope it helps

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)