Hydrogen peroxide loses its potency when it is stored for extended periods of time because it spontaneously breaks down.The following figure illustrates this breakdown, but it is missing a product molecule.Which of the following symbols represents the missing product in this reaction? 
Definitions:
Health Promotion
The process of enabling people to increase control over, and to improve, their health.
Influenza Vaccine
A vaccine that protects against the flu, a viral infection that attacks the respiratory system, and is recommended annually to prevent the spread of influenza.
Stress-Management Strategies
Techniques and methods used to control and reduce stress levels in daily life, promoting mental and physical health.
Registered Nursing
A licensed healthcare professional specializing in patient care, education, and advocacy, having completed a nursing program and passed a national licensing exam.
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