Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > EVOLUTIONARY ADAPTATION

Definition:
Adaptation is an ecological or evolutionary change in structure or
function that produces better adjustment of an organism to its environment
and hence enhances its ability to survive and reproduce.  


Reference:
Nebel, Bernard J. and Richard T. Wright. 1998. Environmental Science: the Way
the World Works.-6th ed. Prentice Hall, Inc. Upper Saddle River, New Jersey.