Which feature of scientific knowledge is correct?

Correct answer: It can be revised when new evidence appears

Direct answer: D. Scientific knowledge can be revised when new, reliable evidence appears. Science is a careful way of asking questions, observing, measuring, testing explanations and checking results. Step by step: a scientist proposes an explanation, makes a testable prediction, collects evidence, compares the result with the prediction and communicates the findings. If stronger evidence later shows that an explanation is incomplete or inaccurate, scientists improve or replace it. This does not make science weak; it makes scientific knowledge self-correcting and evidence-based. Option A is wrong because scientific ideas are not permanently unchangeable. Option B is wrong because science is not based only on belief; evidence and testing are central. Option C is wrong because scientific claims must be open to investigation and checking. Option D is correct because revision in light of evidence is a key feature of science. Memory cue: science changes with evidence, not with mere opinion.