Two genera of bacteria, Bacillus and Clostridium, are capable of surviving in environments low in essential nutrients and humidity due to the production of environmentally resistant structures (capable of resisting the effects of disinfectants, drying, etc.) called:.

Endospore

Explanation:

There are two genera of bacteria, bacillus and clostridium which are able to produce a resistant structure outside their cell wall in the environment where essential nutrients are low and environmental resistance are high. This resistant structure is called a endospore.

The endospore protects the bacteria from the harsh environment and protect the genetic material of bacteria. Endospore allow the bacteria to remain in dormant stage for many years and protect them from disinfectant and drying. Therefore the correct answer is endospore.

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a covalent bond, specfically triple bond