Producers and Decomposers are the minimum requirements for an ecosystem to recycle nutrients.
Nutrient cycle is the movement of the nutrients from the physical environment into the living organisms and then back to the physical environment. Nutrient cycle involves both living as well as non-living components including biological, chemical and environmental interactions and processes.
By the process of obtaining food for energy the biotic factors are grouped as: producers or autotrophs, consumers or heterotrophs and decomposers.
Producers and decomposers are the most important factors which contribute in recycling the nutrients. Producers use the nutrients from physical environment through the process of photosynthesis and decomposers return back the nutrients into the physical environment as they obtain their food or energy by decaying or breaking down the dead remains of organisms chemically. Producers begin the food chain followed by consumers and then decomposers.
the equator is warmer than the poles because the equator is significantly closer to the sun than are the poles (i.e. the equator "bulges out" toward the sun)
The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form a continuous barrier around all cells.
