How is chest cavity formed?

Which of the following is correct ? (i)The diaphragm contracts - volume of chest cavity increased (ii)The diaphragm contracts - volume of chest cavity decreased (iii)The diaphragm expands - volume of chest cavity Increased (iv)The diaphragm expands - volume of chest cavity decreased

How is a cation formed?

A person suffers punctures in his chest cavity in an accident, without any damage to the lungs, its effect could be

What is the full form of ATP ? How is it formed ?

How is HCl molecule formed?

What is acid rain? How is it formed?

Which noble gas is radioactive ? How is it formed ?

How is an anion formed?

How molecules are formed?

How was coal formed?