Final answer:
The given example represents a food chain, where energy and nutrients are transferred from one organism to another in a linear sequence.
Step-by-step explanation:
The given example of Diatoms → krill → crabeater seal → Ross seal → killer whale represents a food chain. A food chain shows the transfer of energy and nutrients from one organism to another in a linear sequence. In this case, diatoms are the producers, krill is the primary consumer, crabeater seal is the secondary consumer, Ross seal is the tertiary consumer, and killer whale is the apex predator at the top of the chain.