Parasitism is a type of interaction between organisms or populations in which one organism gets harmed while the other is benefited. The one getting harmed is often known as the host.
Example: Cuscuta is an example for plants and Human liver fluke and malarial parasites are examples for animals.
Co-evolution is the relationship between two interacting organisms where both organisms failed to survive in the absence of the other.
Example: The flower Ophrys and Bumblebee and the relationship between the fig tree and the fig wasp.
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