Who made the earliest scientific attempts to classify organisms?

Statement $S$: The classification system proposed by Woese is called the three-domain system. Reason $R$: Woese divided organisms into three domains: Archaea,Bacteria,and Eukarya.

The three-domain system of classification is based on which of the following?

The replacement of two-kingdom grouping by five-kingdom classification was proposed in the year

Which type of classification system is Whittaker's five-kingdom classification?

What are the drawbacks/limitations of the Two Kingdom classification system?