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meristem that produces a layer of bark on the outer surface of a plant.
series of interlinked food chains by which energy circulates within an ecosystem.
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...
molecule that forms when carbon dioxide attaches itself to the amino group of a haemoglobin...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...