What can result in the loss of biodiversity?

Non-native organisms cannot survive when introduced to a community.

Ecology is a synonym for environmentalism

The irreversible loss of all populations of a species is known as 

A community consists of all the populations (of multiple species) living in a particular place.

Biodiversity includes

Services that ecosystems provide to humans include

Ecologist study the interactions of organisms with each other and the environment.

The dynamics of every ecosystem depends on two main processes - which two?