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.
For types of dementia that involve degeneration of nerve and brain tissue, you can take action to prevent further damage. It's possible to do this by reducing dementia risk factors, such as by managing high blood pressure, high cholesterol, type 1 diabetes and stopping smoking.