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Corvus splendens insolens is the subspecies of crow found in 

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Important Questions on Diversity in the Living World

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Assertion (A): "The Biological Species" concept helps us to ask how species are formed.

Reason (R): The concept of Biological species focuses our attention on the question of how reproductive isolation comes about.
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Statement (S): Linnaeus system of animal classification is essentially an artificial system, yet it has become a natural system.
Reason (R): Similarities forming the basis in the Linnaeus system are indicative of the genetic relationship. 
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The following are the statement about Parazoa.
1. It includes red algae, fungi, and sponges.
2. It includes multicellular animals.
3. Tissues and organ systems are absent.
The correct combination is 
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The ultimate unit in trinomial nomenclature is:
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The fossil record of placoderms is found in this Era: