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Bacteria is in the last step on a food chain because is a decomposer!!
I think what you are referring to is a food chain, It is a series of energy steps from plants to animals and more animals in the form of food.
trophic level
It decreases.
whales
probably amoeba
trophic levels.
Food chain
Zooplankton get their food from eating phytoplankton. The phytoplankton are the base of the food chain. Zooplankton are primary consumers or the second step in the food chain.
Trophic Level
For each step in the food chain, would be classified as a Trophic Level.For example of a 4 level chain.Grass -> Grasshopper -> Frog -> Snake
Its food chain