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the dramatic increases in crop production around the world from the second half of the twentieth century, as a result of the breeding of high-yield crops, and the wide-scale use of fertilizers and pesticides.
a social structure in which different classes are determined by heredity.
a species that has a large effect on its environment relative to its abundance and plays an...
a substance, usually a liquid, in which other substances can dissolve.
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...