facultative

Definition

In biology, organisms that can switch between different modes of existence depending on what's available, like a metabolic chameleon. Facultative anaerobes can live with or without oxygen (unlike your dramatic houseplants), while facultative parasites can survive independently or mooch off hosts. Think of them as the ultimate opportunists of the biological world, never committed to just one lifestyle.

Example Usage

Yeast is facultative, thriving in oxygen-rich environments but happily fermenting your beer when oxygen runs out.

Source: Biology terminology

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