Symbiotic relationships are relationships between two living organisms. There are three different kinds of symbiotic relationships: mutualism, commensalism, and parasitism. mutualism is when both organisms benefit from the relationship. For example, you and your pet is a mutual relationship because you both benefit. Commensalism is when one organism benefits and one organism isn't affected. For example, a tree and a bird. The bird uses the tree for support and the tree isn't affected. Last, parasitism is when one organism benefits and the other is harmed. For example, mosquitoes and humans. The mosquito is the parasite and the human is the host. The mosquito gets blood and the human loses blood and could possibly get a disease. These are symbiotic relationships.
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