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a perforated wall or part of a wall at the end of one of the individual cells making up a sieve tube.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
the form in which carbon dioxide is transported in red blood cells.
simple connective tissue with a network of white, inelastic, collagen fibres and small, yellow,...
(also called transgenic organism) an organism whose genetic material has been changed using...
the breakdown of food into smaller pieces by chewing and peristalsis.