Is anyone able to talk me through the following questions?

1. The practice of following previous decisions by higher courts in like cases is based on the doctrine ofstare decisis. Fully discuss the benefits and detriments of this practice.

2. Article VI, Section 2 of the United States Constitution allows the federal government to preempt state law under some circumstances. What is preemption? Discuss the limitations of preemption. Explain how this provision benefits society.

constitution.congress.gov

legaldictionary.net/stare-decisis/