Which is the odd one out and why

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Which is the odd one out (and why)?
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Can you label these and describe their role in
maintaining tissue water potential?
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Explain the difference.
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Explain the effect of pituitary extract on urine
output.
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The ears of a rabbit play an important part in
helping the animal to keep its body temperature
constant. After a period of exercise, the insides
of a rabbits ears become redder in colour as the
blood flow to the skin surface increases. Explain
how the different components of nervous
communication are involved in the process leading
to the response shown by the rabbits ears.