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Lichens represent a symbiotic relationships between algae and

Afungi.
Bdiatoms.
Cprotists.
Dmicroscopic anima

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Afungi

Symbiotic relationship would be a mutuality of organisms where the other shares a deep physiological and psychological share of individuality. 
There are several types of biotic relationships that is occurring every single moment in the ecosystem and one is parasitism. In this scenario with human beings and mosquitos, this phenomenon of interaction is distinguished as parasitism where mosquitos draws blood that contains nutrients from the human tissue to use it as its source of food and then leaves harmful substances and bacteria in the human’s blood stream. 

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