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a chemical substance that affects the way the body works.
the region of the kidney where the renal artery enters, and where the renal vein and the ureter...
the use of modern technology to manipulate living organisms to obtain products from them that...
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
an organism that helps to spread a disease, but is not infected with the disease.