Seneca
Sign up

Ecosystems

Biology: Edexcel IGCSE, topic 5.1.1

Ecosystems

An ecosystem is made up of living (biotic) and non-living (abiotic) parts. In an ecosystem, there are different levels of organisation: individuals, populations and communities. These organisms are adapted to specific habitats.

Individuals

Individuals

  • Individual organisms are the smallest part of an ecosystem.
Populations

Populations

  • Populations of individual organisms make up a single species.
Communities

Communities

  • Communities are made up of populations of different species living in the same habitat (environment or area).
Habitat

Habitat

  • A habitat is the combination of biotic and abiotic factors within the natural environment that an organism occupies.
  • Different species are adapted to different habitats.

Test yourself on Ecosystems

  • Levels of Organisation

Practise this topic for free