Which of the following is a characteristic of Clostridium?

Clostridium species are well-known for their ability to form spores, which is a key characteristic of this genus. The spore formation is a survival mechanism that allows Clostridium to withstand extreme environmental conditions, such as heat and desiccation. This spore-forming capability enables them to persist in the environment for long periods and can contribute to the pathogenic potential of certain species, such as Clostridium tetani and Clostridium botulinum.

In addition to their spore-forming ability, Clostridium species are generally anaerobic, meaning they thrive in environments devoid of oxygen, which distinguishes them from aerobic organisms. While some Clostridium species may be non-pathogenic, the ability to form spores remains a primary defining trait of the genus. Thus, the characteristic of being capable of forming spores is the correct answer when discussing Clostridium.