Answer:
citrus
Explanation:
I just did the assignment 
 
        
             
        
        
        
Salutations!
A surface wave on ocean surface is an example of an _______.
A surface wave on ocean surface is an example of an mechanical wave. Mechanical waves are waves that need a substance of medium for the wave's propagation is called mechanical wave.
Hope I helped :D
        
             
        
        
        
Answer: The answer is B- Diffusion of calcium ions through NMDA receptors. 
Explanation:
 Phantom limb pain (PLP) is a painful sensation experienced after the loss or amputation of a limb. The limb is no longer there but the individual can still feel real and severe pains in the limb. This occurs soon after surgery.
 NMDA is a receptor for Glutamate which is an excitatory neurotransmitter. The activation of NMDA receptors are associated with hyperalgesia which is an abnormally heightened sensitivity to pain.