Final answer:
Chemical reactions with constant temperature, reversible reactions, and changes in concentration over time demonstrate homogeneous equilibria.
Step-by-step explanation:
A homogeneous equilibrium is one in which all reactants and products (and any catalysts, if applicable) are present in the same phase, such as a liquid or gaseous phase. Based on this definition, the options that demonstrate homogeneous equilibria are A) Chemical reactions with constant temperature, C) Reversible reactions, and D) Changes in concentration over time.