This is one of the major themes in science. it refers to how something is constructed and how that construction relates to function

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

the answer is c a tornado