Pigments are defined as the set of compounds that have an intense colour and are used in the colouring of other materials. These colouring substances are also called Biological Pigments or the Biochromes, which mainly refers to the true pigments.
Billy gets frustrated and starts to cry. He pushes his bike down on the lawn and throws his helmet off. Then he tells his father that he doesn't want to learn how to ride a bike.
