Is it true or false that all of the energy in every ecosystem on earth comes from sunlight?

False. While sunlight is the primary source of energy for most ecosystems through photosynthesis, some ecosystems, such as deep-sea hydrothermal vent communities, rely on chemical energy from minerals and gases instead of sunlight. These ecosystems demonstrate that energy can also come from non-solar sources. Therefore, not all energy in every ecosystem comes from sunlight.