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the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide and methane that result in global warming.
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
animal wastes (particularly urine) that contain materials high in nitrogen.
the field of study that provides scientific names for organisms, describes them, preserves...
the dramatic increases in crop production around the world from the second half of the twentieth...