Florida Biology EOC Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Biogeochemical cycles describe the movement of elements through living organisms and the environment, which encompasses both biological processes and geological aspects. These cycles illustrate how essential elements like carbon, nitrogen, hydrogen, and phosphorus move through various components of the ecosystem, including the atmosphere, lithosphere, hydrosphere, and biosphere.

The cycles highlight the interconnectedness of life and the physical world, showing how nutrients are recycled to sustain ecosystems. For example, the carbon cycle involves processes like photosynthesis, respiration, and decomposition, where carbon is passed between the atmosphere, living organisms, and the soil. Understanding these cycles is crucial for grasping the flow of matter and how ecosystems maintain their health and productivity over time.

In contrast, other choices involve concepts such as evolution, ecosystem interactions, or energy flow, which are important in their own right but do not encompass the definition and scope of biogeochemical cycles.