Question

which statement identifies a characteristic of a scientific theory?
○ it is subjective.
○ it is a proven fact.
○ it is based on opinion.
○ it may change over time.

Explanation:

• A scientific theory is based on evidence and testing. It is not subjective (subjective implies personal feelings/biases, while theories are objective), not a proven fact (facts are observations, theories explain them and are supported but not "proven" in an absolute sense), and not based on opinion (opinions are unsubstantiated, theories have evidence). Scientific theories can be revised as new evidence emerges, so "It may change over time" is correct.

Answer:

D. It may change over time