Minnow Bass

In a food chain, can a species be both producer and herbivore?

So i have to make a food chain and it goes like this: plankton, amphipods, minnows, bass, seagull
I have to point out the producer, herbivore and top carnivore.
THANKS :)

the producer can never be anything but the producer. since it makes its own food, then unlike the herbivore, it doesn't need to venture outside of it's own body for nutrition. for example, the venus fly trap is a plant, but it's not a producer, it's a carnivore.
so your chain would be like this:
plankton(specifically photoplankton) > amphipids > minnows > bass > seagull. the producer is the plankton. the herbivore is the amphipodm the top carnivore is the seagull. Note that a herbivore is not strictly a plant eater. By definition is on that consumes autotrophs (which can be plants, bacteria, etc)

Note also, that the animals in your chain are more suited for a web since the gull can eat bass and minnow, and the bass can eat minnow and plankton

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