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the introduction of harmful substances (pollutants) into the environment.
biological classification group (taxon) for plants that are divided into classes.
a special kind of biological identification key which consists of sets of organised pairs of...
when an animal accumulates body fat or stores food resources during warmer periods and becomes...
a biological classification group (taxon) that is divided into families.
the dramatic increases in crop production around the world from the second half of the twentieth...