What is the distinction between grazer food chain and decomposer food chain?

Question

i cant understand it would you please help me!!

Answer 1

"Grazing generally describes a type of predation in which an herbivore feeds on plants (such as grasses), or more broadly on a multicellular autotrophs (such as kelp). Grazing differs from true predation because the organism being eaten is not killed, and it differs from parasitism as the two organisms do not live together, nor is the grazer necessarily so limited in what it can eat "

"Decomposers (or saprotrophs) are organisms that consume dead organisms, and, in doing so, carry out the natural process of decomposition."

Answer 2

Grazing is what many herbivores do. Herbivores are the first tier of organisms that consume, swallow, LIVING autotrophic organisms for their stored energy. Snails graze on algae or cows graze on grass however they both rely on gut bacteria to process the cellulose for its stored energy for them by fermentation.

Please note that snails, cows and other creatures swallow their food to digest it internally. Bacteria and fungi digest food outside their body, taking up what they need leaving the rest outside.  

Decomposition is the breakdown of organic molecules like cellulose to their constituent molecules to harvest the last biochemical energy from them. Bacteria and fungi do this & recycle nutrients like nitrogen and carbon back into the environment instead of into an animals gut. Both do this by secreting digestive enzymes on the dead material then they absorb only the nutrients they need leaving the rest to become part of the soil. Only bacteria & fungi are capable of this final step.

Any organism that dies, whether an autotroph or heterotroph, must be recycled by decomposition to complete the carbon & nitrogen cycles. However some detritovores may help along the way by reducing the detritus (carcasses, manure, or leaf litter) in size to expose ever smaller bits to decomposers. Detritivores can be hyenas, earthworms, dung beetles, or any creature that consumes, swallows, NONLIVING organics for its nutrition and digests it internally. This means they are still heterotrophs but they are adapted to ingest, swallow nonliving plant or animal parts that have begun to decompose and not become ill. They do not do the decomposition they just help the process along by reducing it to expose new surfaces to decomposers.