competition

• habitat is the place where an organism lives
• population is all the organisms of one species living in a habitiat
• community is the populations of different species living in a habitat
• abiotic factors is non living factors of the environment, e.g. temperature
• biotic factors are living factor of the environment, e.g. food
• an ecosystem is the interaction of a community of living organisms and non living parts of their environment
• organisms compete for resources to survive
• plants need light, space, water, nutrients from the soil
• animals need territory, food, water and mates. organisms compete with other species (and members of their own species) for the same resources
• in a community, each species depends on other species for things like food, shelter, pollination and seed dispersal- this is called interdependence
• the interdependence of all living things in an ecosystem creates major changes, like species being removed
• in some communities, all the species and environmental factors are in balance so that population sizes are roughly constant, these are called stable communities. these include tropical rainforests
• intraspecific - within a species

  interspecific - different species