As a full-grown adult, a human has how many bones in the body?

• A. 270
• B. 206
• C. 126
• D. 350

Answer: (B)

Verified step by step guidance

1. Step 1: Understand that the number of bones in the human body changes as a person grows from infancy to adulthood. At birth, humans have approximately 270 bones, many of which fuse together during development.
2. Step 2: Learn that by adulthood, the total number of bones in the human body is reduced to 206 due to the fusion of certain bones, such as those in the skull and pelvis.
3. Step 3: Recognize that the adult human skeleton is divided into two main parts: the axial skeleton (80 bones, including the skull, vertebral column, and rib cage) and the appendicular skeleton (126 bones, including the limbs and girdles).
4. Step 4: Compare the options provided in the question. The correct answer is 206, which represents the total number of bones in a full-grown adult human body.
5. Step 5: Remember that the number 126 refers specifically to the appendicular skeleton, while 270 and 350 are incorrect for a full-grown adult but may refer to the number of bones in infants or other contexts.