Populations and Ecosystems

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  • Populations and ecosystems
    • Niche
      • The role of a species within its habitat
        • *biotic interactions : what the organism eats and what it is eaten by           *abiotic interactions : the oxygen it breathes in and the carbon dioxide it breathes out
      • Every species has its own unique niche that can only be occupied by one species
        • If two species try to occupy the same niche they will compete with each other.
          • One of the species will be more successful, until only one is left.
    • Adaptations
      • Adaptations are features that increase an organisms chances of survival
        • Physiological  : processes inside their body
        • Behavioural : the way the organism acts
        • Anatomical : structural features of their body
      • Adaptation to abiotic conditions
        • Otters have webbed paws_walk and swim effectively, increases chance of survival_live and hunt both on land and in water
        • Wales have a thick layer of blubber_helps keep warm in the coldest of seas, increases chance of survival live where their is most food
        • Brown bears  hibernate_lower their metabolism_increases chance of survival as they conserve energy during the coldest winters
      • Adaptations to biotic conditions
        • Sea otters use rock to smash open shellfish_increases chance of survival_access to another food source
        • Scorpions dance before mating_make sure attract a male of the same species_increases chance of successful reproduction by making successful mating more likely
        • Some bacteria produce antibiotics_kill other species of bacteria in the same area_increases chance of survival as less competition for resources

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