B3 - Life on Earth

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  • B3 - Life on Earth
    • Adaptation & Variation
      • Adaptation
        • Something is changed/developed o help in a living environment
      • Species
        • Group of organisms that breed to produce fertile offspring
        • Come from 5 kingdoms of organisms
          • Bacteria
          • Fungi
          • Algea
          • Plants
          • Animals
    • Natural Selection "Survival of the Fittest"
      • Selective Breeding
        • Humans choose features for next generation
          • Only for animals & plants
          • May not help survival
      • Individuals compete for resources to survive
        • Survivers breed with survivers
          • Pass on characteristics that helped survive
            • New generation are better survivers
    • Evolution & Extinction
      • Biodiversity
        • Increasing
          • Human activity
            • Direct
              • Hunting
            • Indirect
              • Destroying habitats
              • Introducing new species to compete with
    • Survival
      • Oxygen
        • For animals and plants
      • Water
        • Needed by living organisms
      • Food
        • For animals
      • Minerals
        • For plants
      • Carbon dioxide
        • Plants
      • Other organisms
        • Food web
          • Primary -> Secondary -> Tertiary
    • Ecosystem
      • Sun
        • Source of energy for nearly all life on Earth
          • Energy transferred through animals eating plants & other animals
            • Also transferred when decomposers feed on dead organisms & waste materials
              • Energy lost as:
                • Respiration (to stay alive)
                • Heat (to surroundings)
                • Waste products (faeces & urine & uneaten organisms)
        • Light energy is converted to chemicals which make up plants' cells
    • Sustainability
      • Living well today & ensuring those in the future can too
      • Environment
        • Not enough resources for population growth
      • Economy
        • Not enough room to farm valuable plants/crops
      • Social
        • Farmers get low yield when nutrients are lost so move to new areas
          • Farmers grown 'Legume plants' which add nutrients to soil so have higher yield
  • Something is changed/developed o help in a living environment
  • Biodiversity
    • Increasing
      • Human activity
        • Direct
          • Hunting
        • Indirect
          • Destroying habitats
          • Introducing new species to compete with

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