1) F means oxygen from plant goes into the atmosphere.
2) Matter is conserved in this process because plants take carbon dioxide from the atmosphere for photosynthesis then produces oxygen into the atmosphere, animals then feed on plants and later the animal's faecal matter is released into the soil and even when animals die, microorganisms in the soil break I down into absorbable form for plants use. which makes matter conserved.
3) Mater is in a circular state from atmosphere to plants to animals to soil then absorbed by plants to restart the process again.
