How do animals relay on photosynthesis?

Animals do not directly rely on photosynthesis, as they cannot perform it themselves. However, they depend on photosynthetic organisms, primarily plants and phytoplankton, for oxygen production and as the base of the food chain. By consuming these plants or other animals that have eaten them, animals obtain the energy and nutrients necessary for survival. Thus, photosynthesis plays a crucial indirect role in sustaining animal life on Earth.