Final answer:
Seals are generally secondary or tertiary consumers, penguins are secondary consumers, and bacteria serve as decomposers. Hence, the accurate trophic levels for seals, penguins, and bacteria are secondary consumers, tertiary consumers, and decomposers, respectively.
Step-by-step explanation:
In the context of trophic levels within an ecosystem, each organism has its own position based on its source of nutrition. The trophic levels are commonly divided into several categories, including producers, primary consumers, secondary consumers, tertiary consumers, and decomposers. Let's define each for the organisms in question:
- Seals are typically secondary or tertiary consumers depending on what they feed on, which could be fish (secondary) or other marine animals (tertiary).
- Penguins, which primarily eat fish and squid, are usually considered secondary consumers.
- Bacteria, particularly those involved in breaking down dead organic matter, function as decomposers.
Therefore, within the options provided, the correct grouping for seals, penguins, and bacteria in terms of their trophic levels would be: (3) Secondary consumers, Tertiary consumers, and Decomposers.