Completion Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is used only once. life science physical science scientific law scientific theory 7. Chemical reactions, gravity, and atoms are topics in the field of . 8. A is an explanation of observations or events that is based on knowledge gained from many observations and investigations. 9. The field of includes the topics of cells and the interactions of living things. 10. A is a rule that describes a repeatable pattern in nature.