ecosystems

• describe population

  all organism of one species living in habitat
• describe community

  all organism of different species living in habitat
• describe ecosystem

  interaction of community of living organisms with non living parts of environment
• describe biotic factors

  living factors
• give examples of biotic factors

  • predators
  • disease
  • availability of food
  • competition
• describe abiotic

  non living factors
• give example of abiotic factors

  • temperature
  • light intensity
  • moisture levels
  • soil ph
  • wind intensity
  • carbon dioxide levels
  • oxygen levels
• give competition for animals

  • territory
  • food
  • water
  • mates
• give competition for plants

  • space
  • light
  • water
  • mineral ions
• give interdependence of ecosystem

  • food
  • shelter
  • seed dispersal
  • pollination
• describe stable community

  species and environmental factors in balance so population sizes remain constant
• give types of adaptations

  • structural
  • behavioural
  • functional
• describe extremophiles

  organisms living in extreme environments - high temperature, pressure or salt concentration
• give reasons to environmental change

  • changed availability of water
  • changed temperature
  • changed composition of atmospheric gases