Are leaves changing color a chemical change

One of the observable changes of a chemical change is the change in color. So, yes, leaves changing color is a chemical changes. This is brought about by biochemical reactions of the plant. The plant is composed of different pigments like chlorophyll, carotenoids and anthocyanins. The dominant one is chlorophyll which gives leaves its green characteristic cholor. The chlorophyll is abundant in plants because it is responsible for the process of photosynthesis. But when the season changes to longer nights and less sunlight, the chlorophyll cannot be used. So, it spends it reserves through other pigments. Hence, it changes color. A yellow leaf has dominant caretonoid pigment.

C. gemstones they are the only non metallic mineral from the list.

You should provide a picture to show where the arrow is pointing and which information that is given. but there are 3 branches of the government, legislative, executive, and judicial. legislative makes laws, executives pass laws, and judicial are the courts