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Which one of the following categories of animals, is correctly described with NO single exception in it?

  1. A
    All mammals are viviparous and possess diaphragm for breathing.
  2. B
    All reptiles possess scales, have a three chambered heart and are cold blooded.
  3. C
    All bony fishes have four pairs of gills and an operculum on each side.
  4. D
    All sponges are marine and have collared cells.

Solution & Step-by-step Explanation

* (A) Incorrect: Platypus is an oviparous (egg-laying) mammal.(B) Incorrect: Crocodiles have a four-chambered heart.(C) Correct: Osteichthyes (bony fishes) consistently have pairs of gills covered by an operculum.(D) Incorrect: Spongilla is a freshwater sponge.

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Which one of the following categories of animals, is correctly described with NO single exception in it?
A
All mammals are viviparous and possess diaphragm for breathing.
B
All reptiles possess scales, have a three chambered heart and are cold blooded.
C
All bony fishes have four pairs of gills and an operculum on each side.
D
All sponges are marine and have collared cells.

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