The basic level of the food chain is the producer level. This level contains plants that make their own food.
A foodchain shows the feeding relationships of organisms from successive trophic levels.
They go to the right, starting with the producers, then the 1st level consumers, then the second level consumers, and so on.
it goes through trophic levels (which is each level of the pyramid ot web or chain) The energy changes from each trophic level
If by "ecosystem" you mean foodchain, then yes. Berries could start a foodchain, therefore are producers.
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That answer above did not really answer the question at all. The reason that the largest animals eat the smallest is due to energy lost with each level up the foodchain. As you go each level up on the foodchain approximately 10% of energy is lost as heat. Only a small portion of energy is conserved as biomass. Thus in order for a large animal to get enough energy it would need a very large supply of its food source which is most readily available in the form of small animals at the bottom of the foodchain such as krill.
They are supposedly at the top.
THE TOP B#$# ahhahah
That thing eats Humans.
The bottom, since they are herbivores.