Legal topics all work together, by teaching people what their obligation are when they make a contract with someone, as well as what is expected of the other person involved in the contract as well. I does not matter if it is a business contract, or the sale on a piece of property. When you are buying a piece of property to me the deed is the legal contract on what the person has for sale, and what all the property comes with, whether it be an easement or water rights. Either way you look at it, all legal topic work together by teaching people what is expected of them, what comes with a piece of property, or the do's and don'ts of everyday business. 

 Take water rights for example, if someone sells a piece of property with a water right, that water right goes with that piece of property, I know that from personal experience, When my wife and I bought our house, the property that is sat on had the oldest water right in the neighborhood, so I received the oldest water right in that area. We live on the outskirts of town, in an old farm house.