Refer to the image and select the option that correctly defines X and Y.
A
X - Basic unit of classification.
Y - Collection of very similar species.
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B
X - Group of orders which have some features in common.
Y - Group of species which have some features in common.
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C
X - Group of species which have some features in common.
Y - Group of orders which have some features in common.
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D
X - Group of phylum which have some features in common.
Y - Group of family which have some features in common.
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Solution
The correct option is B X - Group of orders which have some features in common.
Y - Group of species which have some features in common. Hierarchy refers to the taxonomical classification of living organisms in successive levels of complexity. “Kingdom” is the highest rank in such a classification while “species” is the lowest.