The first level of a food chain should always be a producer of some sort, such as a tree or plant. It is the start of the food chain - and without it, the entire food chain would fall apart and into pieces; as it would disrupt the order of the levels in a food chain.
The first link in the food chain is a producer: Plant
Every food chain begins with the producers: Green plants, shrubs, trees.
a plant
If by "ecosystem" you mean foodchain, then yes. Berries could start a foodchain, therefore are producers.
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.
A human is the lowest thing on the foodchain. Then would come deer, birds, cats, geese and other plant eaters herbivores.
diversity of microorganism in nature very important because it is useful to study of different diseases habitate foodchain
well first is the pig then the bat and then the giant tortoise then the cat
a plant
wakes up
A foodchain shows the feeding relationships of organisms from successive trophic levels.
If by "ecosystem" you mean foodchain, then yes. Berries could start a foodchain, therefore are producers.
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Scottish wildcats are carnivores and sit at the top of the food chain in their habitat. They primarily feed on small mammals like rabbits, rodents, and birds, which makes them apex predators in their ecosystems.
THE TOP B#$# ahhahah
That thing eats Humans.
A foodchain.