Why is it good to use measurable terms in a scientific question?

Correct answer: Investigation and comparison become clear

The direct answer is option A: measurable terms make investigation and comparison clear. A scientific question should use words that can be observed or measured, such as time, mass, temperature, height, distance, or number. For example, “Does 10 minutes of sunlight affect plant height?” is clearer and more testable than “Does sunlight help plants a lot?” The reasoning is: a measurable term gives a definite quantity; a definite quantity can be recorded; recorded values can be compared; comparison allows an evidence-based conclusion. Option A is correct because measurable language makes the question specific and testable. Option B is wrong because measurable terms reduce vagueness rather than increase it. Option C is wrong because wording a question does not itself change the experimental result. Option D is wrong because measurement still requires evidence; it never removes that need. Memory cue: measurable questions can be tested, recorded, and compared.