Reply To: Simple Outline of Lesson Welcome to BFSU: › Forums › Volume One › Learning Progression “B”: Life Science › Lesson B-2. Distinguishing Living or Biological, Natural Earth, and Human-Made Things › Simple Outline of Lesson › Reply To: Simple Outline of Lesson April 10, 2016 at 3:08 pm #887 ScubaMamaParticipant If asked if crude oil or natural gas is biological, what would you say? Is it biological since it was originally living organisms, regardless of the additional processes that have happened over time? Thank you.