Question

which level includes all ecosystems on earth? *
biosphere
biome
community
population

Explanation:

The biosphere is the global ecological system integrating all living beings and their relationships, including all ecosystems on Earth. Biomes are large - scale regions with distinct climates and characteristic plant and animal communities. A community is an assemblage of different populations in a particular area. A population is a group of individuals of the same species in a given area.

Answer:

A. Biosphere