Lesson 2: Relationships Within Ecosystems

A symbiotic relationship that benefits one species but does not harm or benefit the other.

• competition

• overpopulation

• commensalism

• parasitism

A close, long-term relationship between two species that usually involves an exchange of food or energy

• parasitism

• symbiosis

• predation

• niche

The demand for resources, such as food, water, and shelter, in short supply in a community

• competition

• predation

• overpopulation

• commensalism

The act of one organism, the predator, feeding on another organism, its prey.

• competition

• overpopulation

• mutualism

• predation

A symbiotic relationship in which both organisms benefit

• mutualism

• niche

• parasitism

• commensalism

A symbiotic relationship in which one organism benefits and the other is harmed.

• niche

• parasitism

• overpopulation

• predation

The way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs

• competition

• predation

• symbiosis

• niche

Condition that occurs when a population becomes so large that it causes damage to the environment.

• predation

• overpopulation

• commensalism

• competition