Please help me with this honestly I'm clueless It's 7th science work.please help

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Adilute aqueous potassium nitrate solution is

How is the atomic number of a nucleus changed by alpha decay