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What’s the hardest substance in our body? A. Bones B. Hair C. Nails D. Teeth
D. Teeth
Where is the fastest muscle in the body? A. The leg B. The arm C. The fingers D. The eye
D. The eye
How many stripes are on the American flag? A. 50 B. 49 C. 7 D. 13
D. 13
