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Grass is a type of plant with narrow leaves growing from the base. Their appearance as a common plant was in the mid-Cretaceous period. There are 12,000 species now.[3]
A common kind of grass is used to cover the ground in places such as lawns and parks. Grass is usually the color green. That is because they are wind-pollinated rather than insect-pollinated, so they do not have to attract insects. Green is the best colour for photosynthesis.
Grasslands such as savannah and prairie are where grasses are dominant. They cover 40.5% of the land area of the Earth, but not Greenland and Antarctica.[4]
(wikipedia)
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