What type of polymer is represented by the following repeating segment? 
Definitions:
Oxygen-Poor Blood
Blood that has delivered its oxygen to tissues and organs and is returning to the heart and lungs to be reoxygenated.
Superior Vena Cava
Vein that delivers oxygen-poor blood from the upper body to the heart.
Oxygen-Poor
Environments or situations where the concentration of oxygen is significantly lower than the atmospheric levels, often creating challenges for aerobic organisms.
Inferior Vena Cava
Vein that delivers oxygen-poor blood from the lower body to the heart.
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