Energy flow write the term that matches each meaning sum of all ecosystems in the world

1) sum of all ecosystems in the world : Biosphere
Biosphere is the worldwide sum of all ecosystems. It can also be termed the zone of life on Earth. The biosphere overlaps the lithophere, atmosphere, and hydrosphere.
2) All populations within an ecosystem : Community
A community is all of the populations of various species that sleep in a similar space and act with each other. A community consists of all of the organic phenomenon factors of a part.
3) Interbreeding members of a species in an ecosystem : Demes
A deme could be a term for an area population of polytypic species that actively crossbreed with each other and share a definite cistron pool.
4) A defined area consisting of biotic and abiotic components : An ecosystem
An scheme could be a community created from living organisms and non-conscious parts like air, water, and mineral soil.

When scientist examine data such as historical documents, they are using the "scientific methods"