what are the main characteristics of life?
['Intro. [00:00]', 'Organization (all life is composed of 1 or more cells) [02:20]', 'Homeostasis. [02:54]', 'Metabolism (including need to obtain+use energy) [03:35]', 'Reproduction. [04:22]', 'Growth and Development. [04:46]', 'Response to Stimuli. [05:10]', 'Evolution (occurs in populations, can lead to adaptation) [05:58]']