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Answer for the clue "The branch of biology concerned with the relations between organisms and their environment ", 9 letters:
bionomics

Word definitions for bionomics in dictionaries

Wiktionary Word definitions in Wiktionary
n. The study of an organism and its relation to its environment; ecology.

Wikipedia Word definitions in Wikipedia
In ecology , bionomics (Greek: bio = life; nomos = law) is the comprehensive study of an organism and its relation to its environment. As translated from the French word Bionomie , its first use in English was in the period of 1885-1890. Another way of ...

WordNet Word definitions in WordNet
n. the branch of biology concerned with the relations between organisms and their environment [syn: ecology , environmental science ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"science of organic evolution; ecology," 1888, coined by Scottish biologist Patrick Geddes (1854-1932) from Greek bio- (see bio- ) + nomos "managing," from nemein "manage" (see numismatic ).

Usage examples of bionomics.

Any insects there now are there because the bionomics board planned it that way and the chief ecologist okayed the invasion.

We hoped to have a hive of bees some day and the entomologists on the bionomics staff were practically busting their hearts trying to breed a strain of bees which would prosper out doors.

My survival training with Babington should have inured me to such sights, but until now I had not really believed that the matter-of-fact savagery of African bionomics would prevail in my objectified dream world.

The problem of the world, as Branson had said so many times, was in the field of bionomics.