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Cycles in Biology A cycle is an interval during which a recurring sequence of events occurs. Cycles are a hugely relevant component of biology. Practically everything has to be recycled as every resource, to some extent, is a non-renewable resource. There are cycles in all aspects of biology that can be explored. Life-materials are the basic particles of Earth, called elements, that all living organisms build their bodies from. They are sometimes called "bio-elements." All living organisms are made primarily of six elements, all in the same proportion: Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sulphur. Most organisms require small, often tiny, amounts of additional such as iron, copper and iodine. Most plants require a total of twenty-three different nutrients to flourish. Essential nutrients are limited. We use them for energy to power our bodies (food for metabolism) and as materials to build and renew our bodies. We renew or rebuild our bodies over...

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