is all the living and nonliving things in an area and their interactions
Ecosystems
Is all the members of a species living in a certain area
population
Is all the different organisms that live and interact in an area.
Community
Is the way an organisms interact with living and nonliving parts of its ecosystem.
Niche
Is the the close association of members of different species that live together
Symbiosis
is the gradual replacement by one community over time
Succession