Grass deer rabbits fox and bear all make up what level of biological organization

For this item, we are to determine the level of biological organization that is comprised of the following organisms: grass, deer, rabbits, fox, and bear. The answer to this item is Ecosystem. This is because the organisms are not coming from a single species are there should be an interaction or relationship between them in order to survive.

Grass, deer, rabbits, fox and bear all contribute to the production of a biological organisation known as an ecosystem. An ecosystem, by definition is a biological community of many organisms that interact with each other and with their environment. 

The answer is a i believe