<span>Homeostasis is the property of a system, either open or closed, that regulates its internal environment and tends to maintain a stable, constant condition within an organism. (Eg controlling amount of sugar in the bloodstream, keeping waste levels at acceptable levels.) </span>
<span>Opening and closing stomata controls the gas levels within the plant. </span> <span>Converting excess sugar molecules to a lesser number of starch molecules regulates sugar levels. </span> <span>Excreting waste through the cell membrane prevents waste build-up.</span>