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the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...

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substances that have a harmful effect on the environment and also on human health.

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waste matter that is introduced directly and indirectly into the environment by human activities...

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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...

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