Which organisms have the most energy available to them?
a. birds or omnivoresb)plants or producersc)fungi or decomposersd)animals or carnivores

b). plants or producers

The food chain is the linear sequence of transmission of food and energy when one organism is consumed by the other organism. In the energy pyramid of the food chain plants obtain the lower most trophic level which is called as producers. Plants are called as producers or primary producers because they are abundantly present in nature, they are able to synthesize their own food by photosynthesis and large population of animals species relies on them as a source of energy. Therefore, plants or producers are the organisms that have the most energy available in the food chain energy pyramid as the energy decreases from the lower to subsequent higher trophic levels.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.