The producer...usually a plant or tree. (grass\oak tree) As these produce their own food.
If by "ecosystem" you mean foodchain, then yes. Berries could start a foodchain, therefore are producers.
A foodchain shows the feeding relationships of organisms from successive trophic levels.
your moma
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human beings are omnivores.human eats other animals but no animals has humans as a part of thair normal diet.
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That thing eats Humans.
A foodchain.
The bottom, since they are herbivores.
The bottom of the chain
A bear but it rarely happens. It is at the top a the foodchain.