Keya. is a type of taxonomical aidb. is used for identification of plants and animalsc. is based on contrasting characters
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a
a and b
b
a and c
c
b and c
d
a, b and c
answer is D.
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Detailed Solution
Key is a taxonomical aid used for identification of plants and animals based on the similarities and dissimilarities. The keys are based on thecontrasting characters generally in a pair called couplet.