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the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...
substances that have a harmful effect on the environment and also on human health.
waste matter that is introduced directly and indirectly into the environment by human activities...
the introduction of harmful substances (pollutants) into the environment.
a group of atoms that are bonded together. It has an unequal number of protons and electrons and...