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4. Which of the following bones protect the brain?
a. backbone C. ribs b. hipbones d. skull

5. Which of the following components of the skeletal system holds two bones together?
a. cartilage C. ligament b. joint d. tendon

6. Which of the following protect the heart and lungs from injury?
a. skull and breastbone
C. ribs and collarbones
b. shoulder blade and collarbones
d. ribs and breastbone​