What organism is a producer mayfly phytoplankton frog salamander?

Among the organisms listed, phytoplankton is the producer. Phytoplankton are microscopic, photosynthetic organisms found in aquatic environments that convert sunlight and carbon dioxide into organic matter through photosynthesis, forming the base of the aquatic food web. In contrast, mayflies, frogs, and salamanders are consumers that rely on other organisms for energy.