Context: Predators may increase the biodiversity of communities by preventing a single species from becoming dominant. Such predators are known as keystone species and may have a profound influence on the balance of organisms in a particular ecosystem. Introduction or removal of this predator, or changes in its population density, can have drastic cascading effects on the equilibrium of many other populations in the ecosystem. For example, grazers of a grassland may prevent a single dominant species from taking over.

Question: What is the title of a predator that maintains balance with an ecosystem?
Answer: keystone species

Question: What is the driving force for maintaining an equilibrium within an ecosystem?
Answer: biodiversity

Question: When a keystone species is lost another species might become?
Answer: dominant

Question: What is increased by keeping a single species from being dominant in an ecosystem?
Answer: biodiversity of communities

Question: Predators that prevent others from becoming dominant are called what?
Answer: keystone species

Question: What changes to a keystone predator can seriously affect an ecosystem's equilibrium?
Answer: Introduction or removal of this predator, or changes in its population density

Question: What does one singe species usually prevent a predator from doing?
Answer: Unanswerable

Question: What are single species also known as?
Answer: Unanswerable

Question: What influence does one single species have on an ecosystem?
Answer: Unanswerable

Question: What kind of effect happens when a single species population changes?
Answer: Unanswerable

Question: What does a single species dominating the area help promote in a community?
Answer: Unanswerable