What is the biggest ecosystem?

Ecosystem: It is defined as a community of lifeforms in concurrence with non-living components, interacting with each other.

1. It is the chain of interactions between organisms and their environment.
2. It is a functional unit of the biosphere.
3. Habitats of numerous organisms and plants.

The biggest ecosystem:

1. Oceans, occupy 71% of the earth's surface.
2. Oceans support a variety of aquatic lives, directly and indirectly, supporting and sustaining the surrounding ecosystem.
3. Humans, birds, amphibians, and terrestrial animals depend on the ocean in many ways for food, locomotion, reproduction.