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It’s Alive

It’s Alive. What is Life?. An Organism is a living thing. All living things have: Cellular organization Contain certain chemicals Respond to surroundings Grow and develop Reproduce. Characteristics of Life- Cells. Unicellular- single celled organisms

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It’s Alive

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  1. It’s Alive

  2. What is Life? • An Organism is a living thing. • All living things have: • Cellular organization • Contain certain chemicals • Respond to surroundings • Grow and develop • Reproduce

  3. Characteristics of Life- Cells • Unicellular- single celled organisms • Multicellular- many cells and they specialize to perform certain task. • Cell is the basic unit of structure and function of an organism. • Prokaryotic- cells with no true nucleus. • Eukaryotic-cells with a nucleus

  4. Characteristics of Life- Chemistry • Cells are composed of chemicals • Water is the most abundant • Carbohydrates are the main source of energy • Cells also need proteins, lipids, and nucleic acids

  5. Characteristics of Life- Energy and Stimuli • Cells need energy for growth and repair of injured parts. • A change in an organism’s surroundings that causes a reaction is a stimulus. • Tropism- a response to a stimuli ( phototropism, thermal tropism, auditory tropism, gravitational tropism)

  6. Characteristics of Life- Development/Reproduction • Development is the process of change that occurs during an organism’s life to produce a more complex organism. • Reproduction is the ability to reproduce(sexually or asexually), or produce offspring just like you.

  7. Life comes from life • Spontaneous generation theory- mistaken idea that living things arise from nonliving sources. • Redi’s Experiment • Louis Pasteur Experiment • Death of a Pumpkin experiment

  8. Needs of Living Things • Water- needed to survive… to break down chemicals, food, grow, move, and reproduce. • Food- a source of energy • Autotroph vs Heterotrophs

  9. Needs of Living Things • Living space-Need a place to live and gather needed resources to survive. • Stable internal conditions despite the external conditions. • Homeostasis

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