(根据维基百科)[1],“所有已知类型的生物能够一定程度的对刺激的回应,繁殖,生长和发育和通过体内平衡自律。”Further, watching a video like the "[Earth Breathes as Seasons Change][2]" ([which is from NASA][3]) - superficially gives the sense that the "Earth is alive" so to speak. The history of Earth might show that it is able to "grow and develop." Climate change, I would think shows Earth "responds to stimuli" - and that it is able to "self-regulation" conditions to remain stable and relatively constant. [Unable to define what reproduction might be. That said, I do belief that it might be possible (in theory) to define an observable phenomena as being reproductive.] Lastly, think most of Earth Science would agree that at some point "Earth will die" so to speak. **Is it possible to label Earth as an organism?** Please note that your answer must cover if even in theory how Earth is "capable of some degree of response to stimuli, reproduction, growth and development and self-regulation via homeostasis." _______________ **Updates:** - Being dynamic, active, etc. does not mean an entity is an organism: for example, crystals are not organisms. - If Earth does not reproduce, it is not an organism. In my opinion, there's no need to post any comments or answers about the Gaia Hypothesis, since it does not answer the question; meaning the Gaia Hypothesis does not claim that the Earth is an organism. [1]: http://en.wikipedia.org/wiki/Organism [2]: http://www.youtube.com/watch?v=kSNbLYHRrU8 [3]: http://www.nasa.gov/vision/earth/features/blue_marble.html