The severe brain loss before late adulthood can be caused by poor circulation, mad cow disease, and Alzheimer's disease, but not by normal senescence, which is the natural aging process.
The severe brain loss that occurs before late adulthood could be caused by multiple factors, including poor circulation,mad cow disease, and Alzheimer's disease. However, normal senescence, which refers to the natural aging process, is not typically associated with severe brain loss before late adulthood.
Poor circulation can lead to conditions such as stroke or cerebrovascular accident (CVA), where a blockage in blood supply leads to brain cell death. Similarly, mad cow disease, or Creutzfeldt-Jakob disease, is a neurodegenerative disease that can cause severe brain damage. Alzheimer's disease is well-known for its role in cognitive decline and brain damage in the elderly.
Therefore, the factor that would not cause severe brain loss before late adulthood is c. normal senescence.