broad definition - any action of an organism that changes its relationship to its environment. Behavior provides outputs from the organism to the environment.

Basically, any interaction with the environment; any response, any change;

A(behaviour)-->B(covert)-->D(not observable)

Explanations of Behaviour

  1. Biological
  2. Physiological an activity of the brain or other organs hormones, neurotransmitters,
  3. Ontogenetic origination and development of an organism (both physical and psychological) usually from the time of fertilization of the egg to adult; lifespan
  4. Evolutionary lens of evolutionary history remnants of old thingies like getting goosebumps
  5. Functional How it may have evolved genetic drift (accidental) helped survive