Define catchment areas and drainage basins, and include a hypothesis stating how humans impact the health of freshwater resources.

Catchment areas are regions of land where all precipitation—rain, snow, or ice melt—collectively drains to a single point, such as a stream, lake, or reservoir. They are sometimes also called watersheds. A drainage basin is essentially the same concept but may be understood on a larger scale; it is the zone in which all surface water (and sometimes groundwater) converges to a common outlet, such as a river mouth or an estuary. In other words, every drop of precipitation falling within a drainage basin ultimately ends up in the same body of water. Hypothesis on Human Impact on Freshwater Resources: Human activities—including urban development, industrial discharge, agriculture, and deforestation—alter the natural condition of catchment areas and drainage basins. It is hypothesized that increased urbanization and agricultural practices lead to greater runoff of pollutants, nutrients (like nitrogen and phosphorus), and sediments into freshwater sources. This influx not only deteriorates the water quality by promoting problems such as eutrophication but also disrupts the ecological balance, ultimately reducing the overall health and biodiversity of freshwater ecosystems.