Under harsh environmental conditions,some bacteria are able to form thick-walled ______________ to protect them for up to hundreds of years until conditions improve.

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Endospores are highly resistant structures formed by some bacteria under harsh environmental conditions. They can remain dormant for long periods of time, even hundreds of years, until conditions become more favorable for growth and reproduction. Cysts are also structures formed by some organisms, but they are not as resistant and long-lasting as endospores. Zygotes are formed by the fusion of gametes during sexual reproduction and are not relevant in this context. Spirochetes are a type of bacteria with a distinctive spiral shape, but they do not form endospores or similar structures for protection.

Under Harsh Environmental Conditions,some Bacteria Are Able to Form Thick-Walled