Some bacteria may create structures to survive unfavorable conditions. These structures, often difficult to destroy, are called mitotic rings
endogenous shells
biospheres
spores
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The structures that some bacteria can create to survive and resist in unfavorable conditions are called spores.

Explanation:

Some types of bacteria, predominantly Gram-positive, develop spores for survival under adverse conditions.

The mechanism by which a bacterium forms spores is called sporulation, and it creates structures capable of withstanding extreme temperatures or pH, lack of water or nutrients, and even radiation.

The three known types of bacterial spores are endospores, exospores and acineto.

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