Ecosystems

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  • Eco-Systems
    • closed loop cycle
      • no material enters and leaves the cycle
      • no eco-system is perfect
        • some output is always lost
      • Recycling waste products
        • Photosynthesis produces oxygen which is used in repiration
      • Carbon
        • CO2 - photosynthesis - O2 - respiration - CO2
        • released during combustion
    • Reproductive strategies
      • organisms have different approaches
        • fish and amphibians produce a lot of eggs
      • more reproduction, the higher chance of survival
      • unsuccesful fertilities are recycled in the system
    • Vegetation
      • essential in the ecosystem
        • photosynthesis
        • roots help stabilise soil
        • Transpiration from trees encourages cloud formation
        • Trees provide shade
    • Humans affect the Ecosystem
      • rely on the natural ecosystem
        • pollination of crops
      • not closed loop
      • mainly negative impacts
        • harvesting causing soil erosion
        • unbalancing food web
        • replacement of nature for biofuels
        • can cause reduced amount of fresh water
    • sustainability
      • removal = reproduction
      • using what we need for today without harming the future
      • renewable energy
        • wind
        • solar
        • hydro
    • Bioaccumalation
      • toxins build up in food chains
    • Eutrophication
      • 1. fertilizers enter water
        • causing algae to form
          • causing light to be blocked
            • reducing oxygen in water
              • causing plant and animals to die .

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