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Question

Rotifers are

A
Unicellular animals
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B
Multicellular animals
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C
Smallest metazoans
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D
Both B and C
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Solution

The correct option is D Both B and C
  • Rotifers are microscopic and free-living microscopic or near-microscopic multicellular pseudocoelomate animals belonging to the phylum Rotifera.
  • 90% of rotifers inhabit freshwater habitat but some live in brackish water and few in the ocean.
  • They are characterized by having specialized organ systems and a complete digestive tract that includes both a mouth and anus. Since these characteristics are all uniquely animal characteristics, rotifers are recognized as animals or metazoans, even though they are microscopic. As they are microscopic they are called microscopic metazoans. Hence Rotifers are multicellular animals and smallest metazoans.
  • So, the correct answer is 'Both B and C'.

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