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the introduction of harmful substances (pollutants) into the environment.
elongated cells in the xylem of vascular plants that transport water and mineral salts.
a chemical used as an antiseptic to prevent bacterial and fungal growth.
the process whereby useful molecules, such as glucose and amino acids, as well as water and...
specialised heart muscle tissue between the right atrium and right ventricle which conducts the...
the field of study that provides scientific names for organisms, describes them, preserves...