<![CDATA[The study aims to describe the effectiveness of learning tools applied in the learning process to improve critical thinking skills and awareness of maintaining respiratory health organs. This is a development research (research and development) using trial design of One-Group Pretest-Posttest Design. The whole eighth grade students of Pangia State Junior High School in academic year 2021/2022 were selected as the research subjects. The method used in data collection was a test of critical thinking skills and awareness response to maintain the health of respiratory organs. The posttest results show that there was an increase of pretest as much 61,11% and the percentage of students' awareness in maintaining health according to the questionnaire results obtained 87,45% which were included in the very good category. According to the results, it can be concluded that learning activities with guided inquiry model of human respiratory system material effectively improve the critical thinking skills and awareness of maintaining the respiratory organs health.]]>
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