Final answer:
Giant tubeworms in the deep ocean rely on chemosynthetic bacteria for energy and survival, and hemoglobin does not play a role in their physiology.
Step-by-step explanation:
Giant tubeworms in the deep ocean rely on chemosynthetic bacteria for energy and survival. These tubeworms have a symbiotic relationship with billions of bacteria that live inside them. The bacteria convert the chemicals from hydrothermal vents into food for the tubeworms. Hemoglobin plays no role in the physiology of giant tubeworms. Invertebrates, such as tubeworms, use different pigments, like hemerythrin and chlorocruorin, to bind and transport oxygen instead of hemoglobin.