The significance of primary producers in an ecosystem extends beyond energy production; they are critical for maintaining ecosystem structure and function. Primary producers, such as plants and phytoplankton, convert sunlight into chemical energy through photosynthesis, forming the base of the food web. They provide energy and nutrients for herbivores and higher trophic levels, supporting biodiversity. Moreover, primary producers play essential roles in carbon sequestration and oxygen production, contributing to climate regulation and atmospheric balance, thereby sustaining life on Earth.