How can you say that your backbone behaves like a spring?

Our backbone works like a

How can you feel your ribs ?

How can you say that mouth is a munching machine ?

How can you say that mouth is a munching machine?

HCl is reacting with zinc granules. How can you say that it is an exothermic reaction ?

How can you say that forests are biosphere reserves? Give reasons.

How can you make your own stethoscope ?

How can you say that the carbohydrates are not digested in the stomach?

How can you find out your pulse rate ?

How can you say that the group of chlorine (35.5), Bromine(80) and lodline (127.0) is a Dobereiner triad ?