Answer:
C) the facial nerve (VII)
Explanation:
The facial nerve (VII) is a cranial nerve. The cranial nerves are those nerves which arise from the brain. Most of the cranial nerves contain both motor and sensory neurons. Cranial nerves are connect to the various organs. Cranial nerves are associated with parasympathetic nervous system. 
The facial nerve supplies nerve to many glands of the head and neck including lacrimal glands. 
Thus, the facial nerve (VII) provided the stimulus to the lacrimal gland that cause tear while chopping oninons. 
 
        
             
        
        
        
Answer:
The electrical and diffusion potentials for K+ will be equal in magnitude and opposite in direction.
Explanation:
The cell potential may be defined as the potential difference between the inside of the cell and outside the cell. This difference is important for the transmission of nerve impulse.
The equilibrium condition may be defined as the condition at which  the exit and the entrance of the ions will be equal. As the information in the question, Only potassium ions will move inward and outward of the cell. The potassium ions will move in opposite direction since the equilibrium has been reached.
Thus, the correct answer is option (D). 
 
        
             
        
        
        
The answer is either A, the bottleneck effect or C, natural selection. The answer is most likely A because it is hinted that the predator fish was placed in the isolated stream. The predators eating the darters less than 5cm is natural selection though.
        
             
        
        
        
~Hello there!
Your question: <span>What forms when freshwater meets with the ocean?
Your answer: Estuary forms when freshwater meets with the ocean.
Any queries ^?
Happy Studying!
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