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.
Alzheimer's disease is an irreversible and progressive disorder that damages and destroys brain cells, inducing memory loss and negatively impacting cognitive abilities, such as thinking skills and reasoning. There are two types of Alzheimer's disease: early-onset Alzheimer's: develops between the ages of 30 and 60.