 An important aspect of many chemostat models is the principle of competitive exclusion , which states that only the URLanisms which can grow at the lowest substrate concentration will survive \to .
<clarity>  An important aspect of many chemostat models is the principle of competitive exclusion , which states that only the URLanisms which can grow at the lowest substrate concentration will survive \to .
 An important aspect of many chemostat models is the principle of competitive exclusion -- only microbes which grow at the lowest substrate concentration will survive \to .