principle
The word principle can be defined as "a fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning. " A principle of biology is a fundamental concept that is just as true for a bee or a sunflower as it is for us. All life, including that sunflower and bee, is made of at least one cell. The traits of a particular organism are embedded within its genes, that organism must maintain homeostasis to survive, and that organism has evolved from previously existing species.