not easy being green jigsaw puzzle

Green is the colour between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495–570 nm. In subtractive colour systems, used in painting and colour printing, it is created by a combination of yellow and blue, or yellow and cyan; in the RGB colour model, used on television and computer screens, it is one of the additive primary colours, along with red and blue, which are mixed in different combinations to create all other colours. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. In surveys made in American, European, and Islamic countries, green is the colour most commonly associated with nature, life, health, youth, spring, hope, and envy. In the European Union and the United States, green is also sometimes associated with toxicity and poor health, but in China and most of Asia, its associations are very positive, as the symbol of fertility and happiness. Because of its association with nature, it is the colour of the environmental movement.