Which statement about the number of the cervical vertebrae of mammals is correct?

Correct option is D

The correct answer is All mammals have 7 cervical vertebrae and it is a constant.
· All mammals, including giraffes and whales, have exactly 7 cervical vertebrae.
· Their size and shape vary, but not the count.
· This trait is highly conserved in evolution.
· Exceptions are extremely rare (e.g., sloths).
Information Booster:
· Cervical vertebrae support head and neck movements.
· Mutations in this count are linked to diseases.
· Evolution favors structural stability in neck design.
· Vertebrae: cervical (7), thoracic (12), lumbar (5), etc.