To explain this I will say why grass is green and hopefully this 
  will answer your question. Grass is a plant that contains 
 different cells, many of these cells contain Chloroplasts - the 
 part of the plant which uses light to make sugar (which the plant 
  then uses for food). Inside these Chloroplasts is a substance 
 called Chlorophyll which allows the Chloroplast to use light. 
 Light is made up of different colors, which is why you see 
 sunlight as white (all of these colors mixed together). The 
 Chloroplast uses all the components of the light except the 
 green part, which is why you see grass as green. As long as the 
 plant is living and healthy, it should remain green. 
 

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