Q. A bird enters the mouth of crocodile and feed on parasitic leeches. The bird gets food and crocodile gets ribs of blood sucking leeches. Both the partners can live independently. Such an association is

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Solution:

A bird enters the mouth of crocodile and feed on parasitic leeches. The bird gets food and crocodile gets ribs of blood suckling leeches. Both the partners can live independently. Such an association is called proto co-operation. It is a relationship between two species, which is favourable but not obligatory to both.