Fill in the following blanks with suitable words : (a) Gums and resins are the ___products of plants. (b) Bowman's capsule and tubule taken together make a___ (c) The organs which extract the nitrogenous wastes from the blood are___ (d) The extracellular fluid which always flows from body tissues to the heart is called___ (e) The blood cells make antibodies are_________ whereas ___blood cells help in respiration.