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(Environment: every living and nonliving thing surrounds an organism,…

- - - - Competition makes the size of the population remains stable
        
        (Relationships can also be cooperative, one organism benefited from the other and the other one does not have any effect
    - - Determined by biotic/abiotic factors
    - - One species one niche. If two species are playing the same role, the more suitable stay and the other one might face elimination
        
        Competition for a particular niche occurs when there’s invasive species
  - - - Limiting factors: factors that limit the size of population, can be either abiotic/ biotic, e.g. relationship between predators and preys
        
        Few predators, prey population size increase; more predators, prey population decrease, predators starve, predators population decrease as well
  - - - Herbivore: feed on plants
      - Carnivore: feed on animals
      - Decomposer: feed on wastes and dead body of organisms
        
        Decomposition- the process of breaking down dead organisms/wastes into their raw materials and returning those materials to the ecosystem