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Living Systems

Living Systems. Chapter Two: Living Things. 2.1 Is it Alive? 2.2 What is a Living System?. Investigation 2B. Brine Shrimp. What conditions are ideal for the growth of brine shrimp?. 2.2 What is a living system?.

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Living Systems

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  1. Living Systems

  2. Chapter Two: Living Things • 2.1 Is it Alive? • 2.2 What is a Living System?

  3. Investigation 2B Brine Shrimp • What conditions are ideal for the growth of brine shrimp?

  4. 2.2 What is a living system? • As a living system, your body is organized to use matter and energy to move, grow, and survive.

  5. 2.2 What is a living system? • Living systems are made of many different molecules. • A moleculeis a basic unit of matter. • Your body contains molecules that store energy, control life functions, and that even hold all of the information needed to make another you! How are you different from this one- celled organism?

  6. 2.2 What is a living system? • Living systems—like you—contain many levels of organization. • A cell is the basic unit of a living system. • A group of specialized cells that performs a particular function is called a tissue. • An organis a group of tissues that works together to carry out a set of functions. • A group of organs that works together to perform a set of functions is called an organ system.

  7. 2.2 What is a living system? • Living things can respond to changes in their surroundings to maintain a steady internal environment. • The process of maintaining a life-supporting system is called homeostasis.

  8. 2.2 Variables and living systems • All sorts of variables affect an organism’s ability to stay alive. • These include temperature, food, water, and the level of oxygen. • All organisms have built-in processes to help them survive when variables change. Your normal body temperature is 37°C. How does sweating or shivering help you maintain a constant body temperature?

  9. Connection Is there proof for life on Mars? • In 1996, some scientists made a startling claim. • They said that they had evidence suggesting that life existed on Mars more than 3 billion years ago.

  10. Activity Powers of Observation • Observation is a key science skill. • An observation is made with one or more of our five senses: sight, hearing, taste, touch, and smell.

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