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Answer for the clue "Breakdown of more complex substances into simpler ones with release of energy ", 10 letters:
katabolism

Word definitions for katabolism in dictionaries

WordNet Word definitions in WordNet
n. breakdown of more complex substances into simpler ones with release of energy [syn: catabolism , dissimilation , destructive metabolism ] [ant: anabolism ]

Wiktionary Word definitions in Wiktionary
n. (alternative form of catabolism English)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
catabolism \catabolism\ n. the breakdown of more complex substances into simpler ones with release of energy, in living organisms; destructive or downward metabolism; -- a form of metabolism, opposed to anabolism . See also Disassimilation . [Formerly spelled ...

Usage examples of katabolism.

An unbiological order, I call it, because it obeys none of the natural laws of hereditary and environmental change, pays no attention to the survival of the fittest, positively sneers at any attempt on the part of man to work out a rational life cycle, is possibly immortal, unquestionably immoral, evidences anabolism but not katabolism, ruts, spawns, and breeds but does not reproduce, lays no eggs, builds no nests, seeks but does not find, wanders but does not rest.