reflecting light to form images measuring the mass of molecules growing bacteria in a controlled setting observing the strength of physical forces
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What are petri dishes used for in a lab?
Possibilities:
- reflecting light to form images
- measuring the mass of molecules
- growing bacteria in a controlled setting
- observing the strength of physical forces

growing bacteria in a controlled setting