Most microbes need an environment that has a water activity of at least 0.90.

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This statement is true. Most microbes need a water activity of at least 0.90, which means that they require a minimum level of moisture to grow and reproduce. Water activity is a measure of the amount of available water in a substance, and it ranges from 0 (completely dry) to 1 (pure water). Most bacteria, fungi, and other microorganisms require a water activity of at least 0.90 to grow and thrive. Below this level, their metabolism slows down or stops altogether, and they become dormant or die.

Most Microbes Need an Environment That Has a Water Activity