What are the two types of federal legislation relevant to immigration law?

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What are the two types of federal legislation relevant to immigration law? 2. What are regulations? What is their purpose? 3. Once an act is enacted and published, will it always look the same? 4. What is “consolidation"? What is the difference between “source law" and “consolidated" law? 5. What are the two parts of a note-up for legislation? What are you checking for in each part? What tools do you use?