A foodchain shows the feeding relationships of organisms from successive trophic levels.
Of course it is. They are part of an important ecosystem and the foodchain. Polar bears are majestic animals.
If by "ecosystem" you mean foodchain, then yes. Berries could start a foodchain, therefore are producers.
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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.
The bottom, since they are herbivores.
A foodchain.
The bottom of the chain