Answer: matter
Explanation:
Matter is cycled between living and non- living environment. This is done through recycling of atoms by various cycle. Recycle helps in conversation of resources to avoid total losses or depletion of this resources. Nature also help in recycling of this resources to allow its constant availability.
Photosynthesis and nitrogenfixation enables carbon and nitrogen cycle to regenerates atoms through recycling.
Carbon is removed from atmosphere by photosynthesis a process through which green plant produces there glucose and oxygen. It then goes back to the food chain by consumption of this plant by consumers and decomposers,activities of microgranims. The process of respiration by living organism helps release back carbon into the cycle.
Nitrogen is most abundant in atmosphere at 78% it is acted upon by microrganism to make it in available forms for plants use because it not used directly by plant or animal.
