Sedimentary rocks with ripple marks suggest that the rocks were formed where? a) along a beach or stream bed b) when animals walked over them c) from shell fragments of ancient sea-dwelling animals d) when wet mud dried and shrank

Red blood cells are responsible for transporting oxygen in the blood. people with sickle cell anemia were born with a defective gene that results in sickle-shaped red blood cells. individuals with the disease often suffer pain in their extremities due to the build-up of these cells causing blockages in the blood vessels. the shape of the blood cells also reduces the amount of oxygen transported in the blood.