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What is life? (The characteristics of living things (cellular organization…

- - - - You need a microscope to see most cells
      - A cell is the basic structure in an organism
  - - - Carbohydrates are a cells main source of energy
      - Proteins and lipids are the building materials of cells
      - nucleic acids are the chemical instructions that control the cells activities
  - - - Stimuli include changes in light, sound, temperature, etc.
    - - An example would be jumping when you hear a loud noise
- - - - He held a controlled experiment to prove flies can't come from decaying meat
        
        A controlled experiment is when a scientist carries out 2 tests that are the same expect for one thing
        
        Redi's manipulated variable was that the jars with meat were covered and uncovered
      - Flies couldn't enter the covered jar, so maggots were not born
  - - - He proved new bacteria only appeared in broth when produced by existing bacteria
- - - - Some organisms must compete for space
        
        Trees compete with other trees
        
        Roots compete with other roots
  - - - The maintenance of stable internal conditions is called homeostasis
    - - An example would be barnacles because they can close their outer plates, so they can trap water inside them until the next high tide
- - - - Most organisms can only live a few days without water
      - Water is vital because it can dissolve more chemicals than any other substance
  - - - Organisms that create their own food are called autotrophs
        
        An example of an autotroph is a plant
      - organisms that cannot make their own food are called heterotrophs
        
        An example would be an animal