Blueberry jam is high in sugar, a substance cells typically use for energy, and it contains enough other macromolecules to provide the nutrients...

Blueberry jam is high in sugar, a substance cells typically use for energy, and it contains enough other macromolecules to provide the nutrients required to support cell growth. Yet jam can be left unrefrigerated for long periods without contamination by bacteria and mold. Which of the following provides the best explanation for this phenomenon