background vs life history

background

noun
  • One's social heritage, or previous life; what one did in the past. 

  • Information relevant to the current situation about past events; history. 

  • The image or color over which a computer's desktop items are shown (e.g. icons or application windows). 

  • A part of the picture that depicts scenery to the rear or behind the main subject; context. 

  • A less important feature of scenery (as opposed to foreground). 

  • A type of activity on a computer that is not normally visible to the user. 

adj
  • Less important or less noticeable in a scene or system. 

verb
  • To put in a position that is not prominent. 

  • To gather and provide background information (on). 

life history

noun
  • an investigation into the details and activities of a person during his/her lifetime; one's background. 

  • The set of stages that an organism, or a species, experiences over its lifetime, from conception to death. 

  • Information concerning a person's diseases and medical disorders suffered during his lifetime; especially useful if the disorders are genetic. 

How often have the words background and life history occurred in a corpus of books? (source: Google Ngram Viewer )