the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time

an interaction in which one organism kills another for food or nutrients

any relationship in which two species live closely together and that benefits at least one of the species

a type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed

a type of symbiosis in which one organism lives with, on, or in a host and harms it

a type of symbiosis in which both species benefit from living together

the first species to populate an area during succession

the series of predictable changes that occur in a community over time

the number and variety of different species in an area

a species that influences the survival of many other species in an ecosystem

the disappearance of all members of a species from earth

species that are not native to a habitat and can out-compete native species in an ecosystem