Final answer:
Staphylococci and Streptococci are best classified in the group of Bacteria.
Step-by-step explanation:
The Staphylococci and Streptococci are best classified in the group of Bacteria. Staphylococci and Streptococci belong to the group of bacteria, which are single-celled organisms without a nucleus. They are commonly found on the skin and mucous membranes of humans and animals, and can cause various infections.