Which are characteristics of scientific questions? Check all that apply. asking about subjective matters
having a wide focus on many topics
addressing a gap in knowledge
possibly leading to a testable hypothesis
already having fully confirmed explanationsWhy aren't descriptive investigations repeatable?

asking about subjective matters

possibly leading to a testable hypothesis

addressing a gap in knowledge

I got soo confused about that last part. I didn't know if that was an option or something you needed to be answered.

Descriptive investigations are not repeatable because they are based only on observations made at a single point in time. The results may vary at a different time. In addition, descriptive investigations do not contain variables that may indicate cause-and-effect relationships.

the ratio of the conjugate base to the acid required to attain the desired ph.