How, according to you, can peace and liberty be maintained in a state?

Define soil fertility. How can it be maintained ?

The behaviour of matter in different state is governed by various physical law. According to you, what are the factors that determine the state of matter ?

The behaviour of matter in different state is governed by various physical law. According to you, what are the factors that determine the state of matter ?

How can menstrual hygiene be maintained during menstrual days?