In the 1700s, organisms were broken into only two kingdoms - animalia and vegetabilia. throughout the next few hundred years, the name plantae replaced vegetabilia, and other kingdoms began to emerge. finally, in the 1900s, the currently accepted six kingdom system was adopted. currently, the kingdoms include: plantae, animalia, fungi, protista, archaebacteria, and eubacteria. the development of the current classification system is probably due to

The development of the current classification system is probably due to similarities or common characteristics.

Explanation:

Similarities and common characteristics used for classification into kingdoms are: mode of reproduction, cell type and nutrition.So the major characteristics of those 6 kingdoms are:

Im most sure you already answered, but All! (For the fellow Study Island people)

Explanation:

I did this on SI and got proven right... your welcome! ^-^

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides