Symbiosis is a close relationship between two different kinds of organisms, or living things. There are three basic types of symbiotic relationships: mutualism, commensalism, and parasitism. Close living arrangements between two different species is called symbiosis.
In law, a joinder is the joining of two or more legal issues together. Procedurally, a joinder allows multiple issues to be heard in one hearing or trial and is done when the issues or parties involved overlap sufficiently to make the process more efficient or more fair. It helps courts avoid hearing the same facts multiple times or seeing the same parties return to court separately for each of their legal disputes.
A summons is a document that accompanies a complaint at the start of a legal case. It is the document that brings the defendant into the court's jurisdiction. It must be served with the complaint and advises the defendant of his or her obligation to respond to the complaint. A subpoena is not used to start a case. It is used to get somebody to testify as a witness or to produce documents in an existing case. A subpoena is usually not needed to get a party to the case to testify or produce documents, because they are already in the case after having been served a summons and complaint. In both cases, there are rules that tell you how you must deliver the document to make it effective.