• Complex organisms are not difficult to define as "life", but when you get down to microscopic organisms that are simply a single cell, it becomes difficult to define if something is alive, or if it is just a chemical reaction. At what point do you call something alive. There is a gradual scale, so to pick a specific point where you say this is alive and this isn't is a matter of opinion.
  • The more biologists learn about the structure and behavior of the world they study, the less simple the definition becomes. There is a lot of overlap found in non-living things, compared to the living ones. There are several excellent articles on the internet. Here are the links to two of them.
  • Because it's not "simple" to begin with.
  • probably cause life is difficult

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