Dixie - In Memoriam
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You're making an artificial distinction Dixie. In biology any life form that can react to stimuli, reproduce (including replication), grow and maintain homeostasis, is classified an organism. Though I am willing to make an exception for Skidmark being classified as an organism as he has shown little growth, rarely reacts to stimuli, has questionable ability to maintain homeostasis and I seriously doubt that he will ever reproduce.
But are ALL cells, organisms? Yes or no? Also, you are supposed to tell us the difference, in your words, between skin cells growing in a petri dish, and something like the complex organism known as a 'fetus' found in pregnant mammals. Are both of these processes "synonymous" with each other? Is 'replication' exactly the same thing as 'reproduction' when speaking of organism function?