Observations Conversations Publications and calculations Calculations and conversations
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Many things can contribute to the development of a theory. A student made a list of some things that might help scientists develop a theory. Observations Calculations Conversations Publications From the student's list, which must be used in the development of every theory?
Possibilities:
- Observations
- Conversations
- Publications and calculations
- Calculations and conversations

Observations