Agroup of scientists wants to observe the adaptation of a foreign fish species in a river ecosystem. to do this, they want to enclose the top and sides of a section of a river to block light and matter from entering the area. evaluate whether this experimental system is an isolated system. justify your answer based on the definition of an isolated system.

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.