Final answer:
Kylee's theory about recyclable materials must be evidence-based, testable, and subject to change with new evidence to be considered scientific. It should follow the precedent set by enduring scientific theories like John Dalton's atomic theory and must conform to accepted scientific practices.
Step-by-step explanation:
To make Kylee's theory about recyclable materials scientific, it must be built upon empirical evidence and follow the scientific method. Scientific theories must be testable, falsifiable, and capable of being refined or altered with new evidence. John Dalton's atomic theory about the existence of atoms is a fitting example of a scientific theory, as it has not only withstood rigorous testing for over two hundred years but has been expanded upon as more knowledge about subatomic particles has been discovered.
Additionally, scientific practices involve constructing explanations of phenomena based on evidence. Learning about human biology involves understanding that all living systems require constant input of free energy, which is a concept that has been established through scientific methods. Lastly, scientific theories should allow for predictions about the natural world, which can continually evolve with new technologies and discoveries.