Because it contributes to the membrane potential
        
                    
             
        
        
        
Convection 
because convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
        
             
        
        
        
A.  Decomposing water requires a high activation energy.
Explanation:
In decomposing water to release hydrogen gas to make fuel cells, the process requires a very high activation energy. 
                              2H₂O ⇆ 2H₂  + O₂
  This is the overall reaction. O-H must be broken to release free hydrogen to produce hydrogen gas. 
 The O-H bond is a very strong force of attraction that requires a high activation energy to overcome. 
- The activation energy is the energy barrier that must be overcome before a reaction takes place. 
- The sun is a renewable source of energy. 
- Water decomposition produces useful oxygen gas needed by all life for cellular respiration. 
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Answer:
True
Explanation:
A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.