Short Answer
Refer to the diagram below showing a condensation reaction. 
What molecule belongs in the empty blue box?
Describe the processes of gas exchange and factors affecting it, including the role of hemoglobin.
Explain the mechanisms regulating breathing and the impact of different gases on respiration.
Apply knowledge of respiratory physiology to explain responses to environmental changes and pathologies.
Analyze the physiological adaptations in animals to various environments for efficient gas exchange.
Definitions:
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