Final answer:
The ultimate source of energy in an ecosystem is the sun.
Explanation:
The ultimate source of energy in an ecosystem is the sun. Sunlight is essential for photosynthesis, the process through which plants convert light energy into chemical energy stored in glucose. This energy then flows through the ecosystem as organisms consume plants or other organisms.
Learn more about Energy Flow in Ecosystems here:
https://brainly.com/question/41494609
