Ocean water is the least useful.
An ecosystem is a balance environment where many organism interact with their physical environment. This system has a nature in controlling, balancing, and also stabilizing the organism inside its system and it provides them shelter, food and also protection depending to what kind an ecosystem is.
Answer:
I think your missing the answer choices.
Explanation:
or do you not have any.
bc i picked Humans sometimes modify their environment to allow travel and the movement of goods.
From rocks being added together over time
