[{"id": 1, "type": "written_response", "question": "Explain the scientific concept covered in \"Circulatory System Practice\" and provide a real-world example.", "correct_answer": null}, {"id": 2, "type": "true_false", "question": "The scientific method always begins with making an observation or asking a question.", "correct_answer": "True"}, {"id": 3, "type": "multiple_choice", "options": ["Mitochondria", "Cell membrane", "Ribosome", "Nucleus"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}, {"id": 4, "type": "multiple_choice", "options": ["NaCl", "O₂", "H₂O", "CO₂"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 5, "type": "multiple_choice", "options": ["Change direction randomly", "Eventually start moving on its own", "Always accelerate", "Stay at rest unless acted upon by an external force"], "question": "According to Newton's First Law, an object at rest will:", "correct_answer": "Stay at rest unless acted upon by an external force"}]