Based on an analysis of the food web, an observation that deep-sea bacteria consume molecular hydrogen (H2) is most relevant to resolving which of the following apparent contradictions?
Responses:
1. Water gushing from deep-sea hydrothermal vents can be as hot as 400°C, which is a lethal temperature for most organisms.
2. Some deep-sea organisms appear to be primary consumers, but no plants live near the hydrothermal vents.
3. Zoarcid fish are thought to be aggressive predators, but they are frequently described as being lazy swimmers.
4. Some tissues of tubeworms contain hemoglobin, which is an oxygen-carrying molecule, but there is little free oxygen at this depth.