This study aims to analyze students’ critical thinking skills in biology learning on the topic of the human reproductive system at SMA Putra Bangsa, Tangerang Regency. A descriptive quantitative method was employed, with data collected using a validated and reliable Likert-scale questionnaire (Cronbach’s Alpha = 0.936). The sample consisted of 43 students from class XI MIPA. The results showed that students’ critical thinking skills were in the moderate category, with 13.3% scoring between 50%–60%. Hypothesis testing revealed no significant relationship between critical thinking skills and learning outcomes (p = 0.609 > 0.05). These findings suggest that enhancing critical thinking skills requires the application of active learning models such as Problem-Based Learning (PBL) or SIMAS ERIC, along with interactive learning media and teacher training
                        
                        
                        
                        
                            
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