Answer
c. endospore
Work Step by Step
An endospore allows certain archaea and bacteria to survive harsh conditions such as extreme heat, cold, dry periods, and ultraviolet radiation. The endospore has an outer covering made of proteins not easily digested by enzymes and an inner layer of a substance called peptidoglycan, which is made up of sugars and amino acids. An organism in this state is dormant and can remain this way for years until conditions become favorable again.
