True or False Questions

Yes, Every integer is a rational number.  A rational number is a number which can be expressed as a ratio of two integers numerator and denominator where (the denominator not being 0 ).

Hence, Every integer can be expressed in ratio of two integers. 

Primary care physicians or General practitioners (GP) are the one you go first to get a check up, and if they deem that your problem more severe than they can help you, they will send you to a secondary care physicians like specialists in Cardiologists, Neurologists, Dentists, ...

Hence, the given statement, Primary care physicians are responsible for diagnosis and treatment is TRUE.

True, poorly controlled stress and anger can lead to heart attacks and strokes.

Trees that lose all of their leaves for part of the year are known as deciduous trees. Those that don't are called evergreen trees.

The law of conservation of mass states that in any closed system the mass of the system is neither created nor destroyed over time i.e, the mass cannot be changed overtime.

Hence, the given statement is true.

Purchase return and allowances is a contra account to purchases.