Final answer:
Most ecosystems derive their energy from sunlight through photosynthesis.
Explanation:
The ultimate source of energy for most ecosystems is sunlight. Ecosystems rely on photosynthesis to convert solar energy into chemical energy, mainly stored in carbohydrate molecules. This energy is then transferred from producers to consumers, sustaining the ecosystem's energy flow.
Learn more about energy flow in ecosystems here:
https://brainly.com/question/41494609
