That the doorknob isn't used that recently by students, since they don't really use that to study.
The answer is c on a different question
1. New technology is developed that provides more information about the theory.
2. New experimental methods are designed to test a theory.
3. A single experiment produces results that differ from all previous experiments.
im not sure about #3 but it could be it
The answer is litter carbon dioxide bubbles
I hope that helped
The quality or state of being true.
