6. How much saliva can a person produce in one hour?
a) 10 ml
b) 20 ml
c) 30 ml
d) 40 ml
7. How many kilometers of distance can a person walk in their lifetime?
a) 100,000 km
b) 1,000,000 km
c) 10,000 km
d) 160,000 km
8. What is the approximate length of blood circulation within the human body in one day?
a) 5,000 km
b) 10,000 km
c) 15,000 km
d) 20,000 km
9. How much does a person’s ear grow in length per year on average?
a) 0.11 mm
b) 0.22 mm
c) 0.33 mm
d) 0.44 mm
10. What is the approximate percentage of left-handed people in the world?
a) 5%
b) 12%
c) 20%
d) 30%