Answer:
The correct answer is A) a uniform mixture that can’t be separated.
Step-by-step explanation:
All matter whose properties and characteristics are stable and homogeneous is known as the substance. In other words, substance is any matter or material whose chemical characteristics and internal composition are constant, that is, its compounds never vary, remain in time.
Chemical substances are composed of atoms, formular units and molecules. It cannot be separated into components without breaking chemical bonds.
The substances can be presented in the liquid, solid, gaseous or plasma form and each one can be differentiated according to its temperature and pressure.
Then, the correct answer is A) a uniform mixture that can’t be separated.