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 ___________.
A.
the invention of new technology and scientific techniques
B.
the discovery of new organisms
C.
the discovery of differences between organisms
D.
all of these