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NEETZoologyLocomotion and Movement

Which of the following is a characteristic feature of the skeletal system that is conserved across almost all mammals, including human beings?

Options

  1. APresence of exactly twelve thoracic vertebrae
  2. BAtlas articulating with a single occipital condyle
  3. CTotal of thirty-three bones in the adult vertebral column
  4. DPresence of seven cervical vertebrae

Correct answer

D. Presence of seven cervical vertebrae

Step-by-step solution

According to NCERT, a highly conserved characteristic of the mammalian axial skeleton is that the number of cervical vertebrae is seven in almost all mammals, including human beings. The other options are incorrect because: - The number of thoracic vertebrae varies significantly among different mammals (e.g., humans have 12, but horses have 18). - Mammals possess a dicondylic skull, meaning the atlas articulates with two occipital condyles, not one. - The total number of bones in the adult vertebral column varies a

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