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What is Life? (The Characteristics of Living Things (The Chemicals of Life…

- - - - Unicellular
        
        Unicellular organisms are single celled organisms. They include bacteria which has all of the necessary functions to keep the organism alive
      - Multicellular
        
        Multicellular organisms are organisms that are made up of many cells. In many of the multicellular organisms the cells are made to do certain tasks for example muscle and nerve cells
  - - - A stimulus is something that changes an organisms' surroundings
      - Examples of stimuli: Changes in temperature, light, sound, and other factors
    - - A response is how an organism adjusts to the stimulus. (An action or change in behavior)
      - Example of a response: If it is fall and all of the sudden the weather drops from hot to cold your response would be to change from summer clothes to warmer clothes
  - - - Another thing that living things do is the grow. When they grow they are getting larger than they were before
    - - In the lifespan of an organism along with growing larger they also develop. When they develop energy is required to create new cells to make a more complex organism
- - - - Heterotroph
        
        Heterotrophs are organisms that get food from others and don't make their food themselves. Some Heterotrophs eat Autotrophs
      - Autotroph
        
        Autotrophs are organisms that have the ability to make food themselves
  - - - Homeostasis is when Organisms bodies stay stable when their surroundings change drastically
- - - - Redi's experiment was used to show that spontaneous generation does not exist
    - - Uncovered Jar
        
        He left a piece of meat in an uncovered jar. After a couple of days Redi saw that there were maggots on the meat.
      - Covered Jar
        
        He left a piece of meat in a jar that was covered by a cloth that let in air and after a couple of days saw that there was nothing in the jar but the meat. There were no maggot's inside.
      - Conclusion
        
        He Reasoned that flies had been able to enter the uncovered jar to lay their eggs on the meat but on the covered jar none of the flies could get in so there were no eggs meaning no maggots
  - - - Even after Redi's experiment people still believed in spontaneous generation so to prove them wrong Pasteur conducted an experiment using broth
    - - Boiled Broth
        
        In one of his two flasks filled with clear broth where oxegyn was let in but not bacteria from the oxegyn Pasteur boiled it to kill existing bacteria. In a few days the broth remained clear.
      - Unboiled Broth
        
        In the other flask of broth Pasteur did not boil it and then let it sit for the exact same amount of time as the boiled broth. After a few days the broth had become cloudy showing that new bacteria was growing.
      - Conclusion
        
        He concluded that because there was living bacteria present the new bacteria grew in the bottle that was not boiled and because the other bottle was boiled to kill existing bacteria no new bacteria grew