Biology B4 (5)

  • Created by: aleena147
  • Created on: 29-12-19 15:50


ecosystems are organised into diff levels

individual= a single organism

population= all the organisms of one species in a habitat

community= all the organisms different species living in a hbitat

ecosystem= a community of organisms along with all the non-living conditions 

organisms compete for resources to survive

plants need light, space water and minerals from the soil

animals need space food water and mates 

organisms compete with other species for the same resources e.g red and grey squirreles both eat the same food, competition with the grey squirrels fo rthese resources means theres not enough food for the reds so the population of red squirrels is decreasing 

Environmental changes affect communities in dif ways 

the environment in which plants and animals live chnages al the time, these chnages are caused by abiotic and


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