Final answer:
The animal that would display a U-shaped curve of oxygen consumption per unit of time relative to speed is the Sloth.
Step-by-step explanation:
The animal that would display a U-shaped curve of oxygen consumption per unit of time relative to speed is the C. Sloth. Sloths are known for their slow and low-energy lifestyle. They move very slowly and have a low metabolic rate, resulting in low oxygen consumption relative to speed. This behavior is reflected in a U-shaped curve, with oxygen consumption increasing at lower speeds and decreasing as speed increases.