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Sea Urchin Oolopygus pyriformis large
The coexistence of two types of organisms is called symbiosis. There are several types of symbiosis. In mutualism, both species benefit from the cooperation. In lichens, a fungus and green algae work together. In commensalism, one species has the benefit, but the other is not experiencing any disadvantages. An example is the sucking fish that swim with sharks. Parasitism is harmful to one of the species, for example ticks or fleas.
In endothermic symbiosis the kinds of life interwoven with each other. A good example is the coral Syringopora from the Ordovician period, through which a stromatopore has grown.
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