Which of the following best embodies the qualities of a scientific theory?

1. squirrels in central illinois prefer to build their nests in oak trees instead of hickory trees.
2. all gases, liquids, and solids consist of atoms.
3. prairies that have larges herds of bison show greater plant diversity than prairies without bison.
4. dangerous wildfires in california could be avoided by better fire prevention strategies.
5. students who study for their environmental science exams will perform better on those exams than those who do not.