Answer:
Prions
Explanation:
Prions are misfolded proteins found in the brain, they cause other proteins to fold the same way. The cell can't degrade the proteins which leads to an accumulation of these misfolded proteins and the development of neurodegenerative diseases like Alzheimer and Parkinson 
 
        
             
        
        
        
It would be fittest
hope this helps
        
             
        
        
        
Energy is the capacity of a physical system to perform work. Energy exists in several forms such as heat , kinetic or mechanical energy, light, potential energy , electrical, or other forms. Energy is the ability to do work. Energy sources could be classified as Renewable and Non-renewable.