A model that can be used to depict the ecosystem will be:
Salmon - Sculpin - Mollusc - Green algae.
It should be noted that a model simply means a representation of a particular thing. It's used to demonstrate a process.
In this case, a model that can be used to depict the ecosystem will be:
Salmon - Sculpin - Mollusc - Green algae.
The trophic level is from the tertiary consumer to the secondary consumer to primary consumer and the algae is the producer.
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