Setting aside the notion of determining the number of individual animals on the planet for a moment, merely determining the number of species on the Earth is challenging. Science has only been able to offer estimates thus far, and totals vary greatly.
A. A. A. Multiple sclerosis, or MS, is a long-lasting disease that can affect your brain, spinal cord, and the optic nerves in your eyes. It can cause problems with vision, balance, muscle control, and other basic body functions. The effects are often different for everyone who has the disease.
ALS, sometimes called Lou Gehrig's disease, is a progressive brain disease that attacks the nerve cells that control muscles (motor neurons). It results in the gradual degeneration and death of motor neurons that are located in the brain, brainstem, and spinal cord.