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How oxygen levels would decrease if trees went extinct., References in APA…

- - - - Evidence
        
        Experiments/Test
        
        Conclusions
        
        Trees do indeed play a crucial role in maintaining oxygen in our ecosystem. We learned that many trees are needed to produce just a small amount of oxygen needed for humanity to survive. If we take away trees, there is no chance that any other lifeforms will manage to survive
        
        An experiment can be done where oxygen levels are measured in an area with many trees, and then in one with significanly less.
        
        Independent: The amount of trees
        
        Dependent: Amount of oxygen recorded
        
        The experiment is an observational,
        as it is based on observing the
        environment without modifying it
        
        The experiment is experimental,
        as there isn't a way to control
        most of the environment
        
        Constants: Tree type and general characteristics of the locations
        
        Tropical forests account for about 34% of land photosynthesis.
        
        An acre of urban trees can produce enough oxygen for eight people and absorb 188 pounds of CO₂.
        
        Tropical rainforests, while covering only about 6% of Earth’s surface, may produce around 40% of the planet’s oxygen
      - If trees went extinct, oxygen levels would be at an all time low, because trees produce a large amount of oxygen.