Final answer:
Round-shaped bacteria, or cocci, can appear singly, in groups, chains, or clusters. They can form different arrangements, such as diploids, tetrads, chains, or clusters.
Step-by-step explanation:
The characteristics of round-shaped bacteria, also known as cocci, include appearing singly, in groups, in chains, or in clusters. Cocci bacteria can form different arrangements, such as diploids (pairs), tetrads (groups of four), chains, or clusters. These arrangements can help in the identification and classification of bacteria.