A) species
B) genus
C) family
D) phylum
Correct Answer: A
Solution :
The basic unit of classification is species. It is the lowest category of classification. It is a group of closely related individuals with similar morphological, anatomical, biochemical and cytological characters. It is a group of naturally interbreeding population with ability to produce fertile offsprings. Individuals of a species share a common gene pool. Species is reproductively isolated, thus genetically closed system. Species has the real existence in nature. The term species was given by John Ray, an English naturalist.
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