Cycle - GCSE Biology Definition

In GCSE Biology, a 'cycle' refers to a series of events or processes that repeat in a sequence over time. One example is the carbon cycle, where carbon moves through living organisms, the atmosphere, oceans, and the earth. In this cycle, plants take in carbon dioxide during photosynthesis and release oxygen. Animals then use this oxygen for respiration, releasing carbon dioxide back into the atmosphere. This cycle is important because it helps maintain balance in the environment by recycling essential elements. Cycles in biology often play a crucial role in sustaining life on Earth by ensuring that vital materials are continuously renewed and made available to all living things.