Question

Humans beings occupy the top level in the food chain, what are the other levels and how they are important

Answer 1

other levels can be of scavengers
they are important as they balance our ecosystem

Answer 2

other levels can be defined by saying that we human are tertiary consumers
omnivores and carnivores are secondary consumers
herbivores are primary consumers plants are the source of food
if any one of them is disturbed the whole food chain is ruined ..or suppose the plants is not there then the entire food chain is disturbed because carnivores wont get food..human also depends on plants etc