Question8 The unicorn is the national animal of ScotlandSelect an alternative False True The Atlantic Ocean is the biggest ocean on Earth.Select an alternative False True Spiders have six legs.Select an alternative True False There are five different blood groupsSelect an alternative False True The human skeleton is made up of less than 100 bones.Select an alternative False True ResetMaximum marks: 5 Flag question undefined

Select an alternative False True

Question

Question8 The unicorn is the national animal of ScotlandSelect an alternative False True The Atlantic Ocean is the biggest ocean on Earth.Select an alternative False True Spiders have six legs.Select an alternative True False There are five different blood groupsSelect an alternative False True The human skeleton is made up of less than 100 bones.Select an alternative False True ResetMaximum marks: 5 Flag question undefined Select an alternative False True单项选择题

A

False

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True

Select an alternative False True

BlackTom AI · Accepted Answer

An adult human skeleton contains 206 bones, so the statement "The human skeleton is made up of less than 100 bones" is false.

1) Relevant knowledge points and concepts
- Human skeletal anatomy: the skeleton is divided into the axial and appendicular skeletons. Adults have 206 bones; infants have more (~270) because some bones fuse during development.
- Counting principle: summing standard bone groups shows the total exceeds 100.

2) Step-by-step reasoning and counts
- Axial skeleton:
  - Skull (cranial and facial bones): 22
  - Auditory ossicles (middle ear bones): 6 (3 in each ear)
  - Hyoid bone: 1
  - Vertebral column (cervical, thoracic, lumbar, sacrum, coccyx as counted in adults): 26
  - Thoracic cage: ribs 24 (12 pairs) + sternum 1 = 25
  - Axial subtotal = 22 + 6 + 1 + 26 + 25 = 80
- Appendicular skeleton:
  - Pectoral (shoulder) girdles: 4 (2 clavicles + 2 scapulae)
  - Upper limbs: 30 bones per limb × 2 = 60 (humerus, radius, ulna, carpals, metacarpals, phalanges)
  - Pelvic (hip) girdle: 2 (two hip bones)
  - Lower limbs: 30 bones per limb × 2 = 60 (femur, patella, tibia, fibula, tarsals, metatarsals, phalanges)
  - Appendicular subtotal = 4 + 60 + 2 + 60 = 126
- Total skeleton = axial 80 + appendicular 126 = 206 bones

3) Intermediate steps shown above demonstrate the sum well exceeds 100.

4) Why the correct answer is correct
Because the standard, accepted total for an adult human skeleton is 206 bones, the claim that it has fewer than 100 bones is demonstrably incorrect.

5) Why other possible answers (True) would be incorrect
- Answering True would contradict anatomical facts and the counted total of 206 bones.
(If the context included other earlier statements in the prompt: "The unicorn is the national animal of Scotland" is True; "The Atlantic Ocean is the biggest ocean" is False — the Pacific is largest; "Spiders have six legs" is False — spiders have eight; "There are five different blood groups" is inaccurate in common usage — ABO yields four primary groups, and including Rh increases categories.)