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ECOSYSTEM, Ecosystem is a biological community of interacting organisms…

- - - - fleas and human
  - - - Facultative mutualism
        
        Species survive on their own under favourable conditions
      - Obligate mutualism
        
        One species is dependent for survival on the other
      - Diffusive mutualism
        
        One entity can live with multiple partners
      - purpose
        
        Defensive mutualism
        
        Trophic mutualism
        
        Dispersive mutualism
    - - bees and flower
  - - - Inquilinism
        
        An entity occupies living habitat of another species(burrow, nest)
      - Chemical commensalism
        
        A bacteria produces a chemical which nurtures another bacteria
      - Phoresy
        
        An organism tentatively attaches itself to another entity for transportation requirements.
      - Metabiosis
        
        One entity is dependant on the other for survival
    - - shark & remora
      - bird making nest in tree
  - - - Tall and wide plants hinder the growth of comparatively smaller plants
  - - - Snake eats frog
      - Lion and Cheetah compete to hunt deer
- - - - pyramids of biomass
        
        total mass of the orgamisms in each trophic level
      - pyramids of numbers
        
        number of organism in each trophic level in a food chain
  - - - Tertiary consumer
      - Quaternary consumer
      - secondary consumer
      - primary consumer
      - producer
  - - - secondary consumer
      - primary consumer
      - producer
- - - - break down material
      - recycle nutrient
      - Examples
        
        earthworms
        
        termites
        
        millipedes
    - - produce food
      - example
        
        Plants
        
        algae
    - - animal / plant that eat plants or other animals
      - example
        
        grasshopper
        
        tiger
        
        human
  - - - soil
      - water
      - air
    - - dessert
      - meadow
      - ocean
      - seashore
      - ponds