Answer:
The producers can be described as organisms which are able to make their own food through the process of photosynthesis. Phytoplankton is hence the producers in this food chain.
Primary consumers can be described as organisms which feed on the producers. Copepods are the primary consumers in this food chain.
Secondary consumers can be described as organisms which feed on the primary consumers in a food chain or food web. Sea-nettle jellyfish is the secondary consumer in the above food chain.
