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Like cement sets the foundation for a house, the cell theory sets the foundation for biology. Schleiden and Schwann proposed the cell theory, which states that the cell is the basic unit of life and that new cells arise only from the reproduction of already existing cells via cell cycle, in 1839.
Since the cell is the structural and functional unit of life as the house is for a community, without the house the community would be irritated and would not be stable, the community would therefore cease to exist. Just as there are requirements for a house to be classified as safe, secure and livable, there are 10 requirements for an organism to be classified as living. These 10 characteristics include:
1. The ability to move~ either by using motion or locomotion
2. Ability to respond to short-term environmental changes~ with irritability when detrimental or responsiveness when positive.
3. Ability to adapt to long-term environmental changes~ by making necessary changes to survive.......

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Approximate Word Count: 1115
Approximate Pages: 5 (250 words per double-spaced page)

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