It consists of approximately 4–6 trophic levels. It consists of many trophic levels. The food chain is a simple and easy process. It is a complex process. Example: grass -> rat -> frog -> snake ...

Because heterotrophs such as animals do not assimilate all their food and ... Although the trophic level of a consumer can be determined by following the longest feeding chain, trophic position ...

Predators at the top of a marine food chain 130 million years ago ruled with more power than any modern species, McGill research into a marine ecosystem from the Cretaceous period revealed.