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What is Life? 2011-12
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How is an organism living? There are 6 characteristics of life Organization, chemical composition, energy, responds to surroundings, grow and development, reproduce There are 4 needs of living things Water, food, living space, homeostasis There are 6 characteristics of life Organization, chemical composition, energy, responds to surroundings, grow and development, reproduce There are 4 needs of living things Water, food, living space, homeostasis
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Cell Organization Cells are basic building blocks of life Organisms are either multicellular or unicellular There are five levels of cell organization: Cells, tissues, organs, organ systems, organism Cells are basic building blocks of life Organisms are either multicellular or unicellular There are five levels of cell organization: Cells, tissues, organs, organ systems, organism
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Chemicals of Life All organisms are composed of chemicals Carbohydrates (energy source) Proteins Lipids Nucleic Acids (genetic material) All organisms are composed of chemicals Carbohydrates (energy source) Proteins Lipids Nucleic Acids (genetic material)
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Use of Energy Organisms must use energy to perform functions
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Respond to Surroundings Organisms react to their environment and changes in the environment
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Grow and Develop Organisms grow to become larger Development is a change that occurs during the organisms life to produce a more complex organism Organisms grow to become larger Development is a change that occurs during the organisms life to produce a more complex organism
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Reproduce Organisms reproduce to produce offspring to continue to survive
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Needs of Organisms Water: organisms can’t survive without it Food: organisms need a source of energy to survive Living space: organisms need a place to get food, water, and shelter Stable internal conditions: (homeostasis) organisms must be able to keep their bodies stable Water: organisms can’t survive without it Food: organisms need a source of energy to survive Living space: organisms need a place to get food, water, and shelter Stable internal conditions: (homeostasis) organisms must be able to keep their bodies stable
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