(D) The presence of $7$ cervical vertebrae is a common characteristic feature of almost all mammals,including humans,giraffes,and whales. While there

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They have seven cervical vertebrae

(D) The presence of $7$ cervical vertebrae is a common characteristic feature of almost all mammals,including humans,giraffes,and whales. While there are rare exceptions (like sloths or manatees),this is considered a defining anatomical trait across the class $Mammalia$.