What is a species?

  • A
    $A$ real unit of classification devised by taxonomists
  • B
    The highest unit of classification
  • C
    $A$ real unit of classification
  • D
    An artificial concept of the human mind which cannot be defined in absolute terms

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The figure shows a system of logic gates. From the study of the truth table,it can be found that to produce a high output $(1)$ at $R$,we must have:

Inheritance of skin colour in human is an example of

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