What is formed by all the ecosystems of earth

The correct answer is the biosphere. The biosphere consists of all of the ecosystems which means it has all of the life forms that exist. It is combined with the litosphere, the amosphere, and the hydrosphere, to create the earth. All of the systems work together perfectly in nature unless obstructed by humans who often create troubles for the spheres.

Ichoose a as my answer

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce