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simple inorganic chemical substances (mineral salts) that are needed in very small amounts for normal growth and development of a living organism.
a substance, usually a liquid, in which other substances can dissolve.
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
single-celled organisms with all life functions performed within the cell.
blood that has no antibodies (blood group AB) and can receive any type of blood.
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...