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a chemical substance found in food that is essential for maintaining life.
the clearing of large areas of natural forest, mainly to free up land for agriculture and or...
fats that are liquid at room temperature. They are found in plants.
small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind...
in plants: the first plant to become established in an area.in plants: the first plant to become...