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answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.