A. A functional unit of biotic and abiotic components which have an energy source
B. Either a part of land surface, a body of fresh water or the open oceans
C. A functional unit consisting of sunlight, air water and minerals
D. A system consisting of an energy source, producers and consumers
Correct Answer: A functional unit of biotic and abiotic components which have an energy source ✔
Last Updated: May 16, 2024