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A particular species ‘X’ has more charac...

A particular species ‘X’ has more characteristics with species 'Y', whereas another species 'Z' has less common characteristics with species 'Y'. Which two species are more closely related? Why? On what basis are the eukaryotic organisms further classified? Why is this basis important? What is the importance of homologous organs?

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Species .X. is more closely related with species .Y..
The more closely related species will have more characteristics in common. Hence species X and Y are closely related.
Eukaryotic organisms are further classified on the basis of whether they are unicellular or multi- cellular.
This basis marks a very fundamental difference in body design, because of specialisation of cell types and tissues.
Homologous organs help to identify an evolutionary relationship between apparently different species.
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