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From Biolecture.org
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<p><strong><span style="font-size:20px">Abstract</span></strong></p>
<p>I will suggest the definition of life through the feature of biological phenomena which consist of cell, are metabolism, response about stimulation, development and growth, inheritance and reproduction, evolution and adaption</p>
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<p>Response about stimulation</p>
<p>It is related to signaling. Life should know what happen in the surrounded environment. When there are some energy sources(food) surrounding the organism, it need to know where the food is to eat them and make energy . When pathogen such as virus or bacteria infect the organism, it should know what happens to defense and cope with it. In the multicellular organism, each cell need to know what happens surrounding themselves to cell communication through receptor and signaling molecule. There organism need to have ability to know what happens around and cope with by response about external stimulation.</p>
