Scientists once used the general term bacteria to describe all prokaryotes. Why has the classification of bacteria been changed?
A.
Evidence shows that prokaryotes include two distinct groups, so Bacteria and Archaea are now two domains of prokaryotes.
B.
Evidence shows that archaea evolved before bacteria, so Bacteria are now a kingdom of prokaryotes in domain Archaea.
C.
Evidence shows that bacteria have nuclei and membrane-bound organelles, so Bacteria are now a domain that includes only single-celled eukaryotes.
D.
Evidence shows that bacteria are closely related to eukaryotes, so Bacteria are now a kingdom of prokaryotes and single-celled eukaryotes