The correct answer is known as Endospore or Endospores.
An Endospore is described as a dormant, strong, and non reproducing structure manufactured by specific bacteria from the Firmicute phylum. The term "endospore" suggests of a spore or seed-like body, it is not to be considered as a true spore. It is a broken-down, dormant form to which the bacterium can lower itself.
