Which Greek term was first used by Ernst Haeckel in 1866 to refer to ‘the relation of animals to both the organic as well as the inorganic environment’?

In 1866, German biologist Ernst Haeckel coined the Greek term Oekologie (which evolved into "Ecology" in English). He derived it from the Greek words oikos (meaning house, home, or dwelling place) and logos (meaning the study of) to define the comprehensive scientific study of the interactions and relations of organisms with both their living (organic) and non-living (inorganic) environment.