A parasite is an organism that takes from and hurts its host organism in order to survive. 

Parasite

Parasitism is a type of symbiotic relationship in which one symbiont (the parasite) benefits while the other (the host) is harmed.

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- Mutualism
- Commensalism
- Parasitism
- Neutralism
- Amensalism
- Competition

Types of Symbiotic Relationships

Paracer, Surindar; Ahmadjian, Vernon (2000), Symbiosis: An Introduction to Biological Associations, Oxford University Press,ISBN 978-0-19-511806-3

Symbiosis: An Introduction to Biological Associations

Mutualism is a type of symbiotic relationship in which each symbiont benefits overall from the relationship

Mutualism

Commensalism is a type of symbiotic relationship in which only one of the symbionts benefits from the relationship, but neither is harmed.

Commensalism

Parasitism

Amensalism is a type of symbiotic relationship in which one symbiont is harmed or killed by another symbiont who is unaffected by the first.

Amensalism

Neutralism is a symbiotic relationship in which the organisms interact but do not have any effect on each other (or in practice, an insignificant effect).

Neutralism

A relationship in which the biological success of one of the organisms is reduced by the presence of the other.

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