Nutrient+Cycles

====This is a very short topic in term 3. We learnt about both carbon cycles and nitrogen cycle. Carbon, oxygen and nitrogen are essential nutrients for life. In natural ecosystems, these nutrients are release back into the soil when organisms die. For example, decomposers break down dead bodies. And the materials locked up in the dead organisms can then be returned to the physical environment to be used again by green plants. For example, in the carbon cycle, carbon is first transferred to organisms from the atmosphere through photosynthesis in plants. This carbon can be returned to the atmosphere through numerous methods such as combustion, respiration and decomposition. ====

====This topic was a self-study topic and it was pretty easy. We only have to memorise the cycles and different methods of how the nutrients are being transferred to organisms and how they return back to atmosphere again. ====