Animals have always been used in psychological studies, and in recent years the number has declined further.
declined further compared to when?

Name: Animals have always been used in psychological studies, and in recent years the number has declined further. declined further compared to when?
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Question

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The sentence states that the number of animals used in psychological studies has declined further in recent years, implying that it has declined compared to a previous point in time.

Animals Have Always Been Used in Psychological Studies, and in Recent