Multiple choice

The longest bone in the human body is

  1. thigh born

  2. ribs

  3. back bone

  4. ulna
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The femur (thigh bone) is the longest and heaviest bone in the human body, typically about 50 cm long in adults. The 'born' in option A is a typo for 'bone'. The spine (back bone) consists of many small vertebrae, ribs form the ribcage, and ulna is a forearm bone.

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