Question

what is the best description of what has happened to flowers when they change color as they mature? a physical reaction a formation of a mixture a chemical reaction

Explanation:

When flowers change color as they mature, it involves a change in their chemical composition. A physical reaction would not change the chemical structure, just the physical state. The formation of a mixture is not relevant here. A chemical reaction involves a change in chemical substances, which is what occurs when flower color changes during maturation (e.g., changes in pigments like anthocyanins due to chemical processes).

Answer:

a chemical reaction