The answer is; Pepsin
Pepsin is first secreted by the chief cells of the stomach wall and the inactive precursor called pepsinogen. When pepsinogen interacts with the acidic environment of the stomach due to hydrochloric acid, it is turned to pepsin. The pepsin breaks down large protein molecules to smaller molecules. 
 
        
             
        
        
        
Fasciae are layers of connective tissue, mainly collagen, situated under the skin, which closes, supports, and separates muscles and other structures. Fasciae are grouped by their anatomical location, layer (as visceral fascia, superficial fascia, and deep fascia), or by their functions. Fasciae reduces friction and provide an adjustable covering for nerves and blood vessels as they move through muscles.
 
        
             
        
        
        
Answer:
1000 mM
Explanation:
Using V = -60 mV㏒₁₀[K/K'] where V = membrane potential = -60 mV, K = intracellular concentration = unknown and K' = extracellular concentration = 100 mM
So, V = -60 mV㏒₁₀[K/K'] 
-60  mV = -60 mV㏒₁₀[K/K']
dividing both sides by -60mV, we have
-60  mV/-60 mV = ㏒₁₀[K/K']
㏒₁₀[K/K'] = 1
taking antilogarithm of both sides, we have
 [K/K']  = 10¹
multiplying both sides by K', we have
K = 10K'
K = 10 × 100 mM 
K = 1000 mM
So, the intracellular Cl- concentration is 1000 mM
 
        
             
        
        
        
The process of grouping things based on their similarities is classification