Spontaneous Generation

Francesco Redi

1. All living things are made of cells Cells are the basic building blocks of all living things. Cells come from other cells Unicellular: single celled organisms (bacteria) Multicellular: organisms made of many cells (humans) Display organization Are composed of the same basic elements: C H O N

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2. Living things grow and develop Birth develop- become more complex Lifespan: the maximum length of time an organism can live

3. All living things can move Animals move to find food and shelter. Movement can be the difference between life and death. Plants do not move, but they bend toward sunlight. All living things also have internal movement of substances (food, water, waste, etc.)

4. Living things reproduce Sexual reproduction: Two partners required (male and female) Most are multicellular Asexual reproduction: Only one parent, meaning the organism has all it needs to reproduce on its own Bacteria, fungi, and some plants Budding / Binary fission

Reproduction continued… In both types of reproduction, the offspring receive a set of special chemical “blue prints” or plans that determine the characteristics of that living thing, which will again be passed on the next generation. These “blue prints” of these characteristics is also known as DNA

5. Living things respond to their environment Stimulus: signal to which an organism reacts (change in environment – Ex.)When the season changes from winter to spring there is much more dust and pollen in the air. Response: some action, movement, or change in behavior due to stimulus -Ex.) you sneeze to keep germs, pollen and dust from entering your body.

1-11 Adaptations come about through evolution. Evolution is the process by which a species changes through time. 6. Living things adapt

7. All living things obtain and use energy Metabolism: The sum total of all chemical reactions that occur in living things- produces energy and basic materials needed for life processes Ingestion: To take in food and nutrients Digestion: Break down of food We get the energy we need by combining the foods you eat with the oxygen you breathe (respiration). Excretion: Getting rid of waste materials

8. All living things are homeostatic Homeostasis is the ability of an organism to maintain relatively constant internal conditions. An example is temperature regulation in the human body. All organ systems contribute to homeostasis.

In order to be considered living, it is a must that an organism possesses all of these 8 characteristics, not just some....

For instance…a computer.... HAS: organization, uses energy, maintains homeostasis but... DOESN’T HAVE: cells, grow or develop, reproduce