Read the statements given below and fill up the blanks with the correct words listed in the box.
deep, ductless, nutrients, thyroxine
(a) The meal that includes all ___ is a balanced diet.
(b) Insufficient production of
(c) Endocrine glands are also called
(d) After attaining puberty boys develop a___ voice.
(a) nutrients
(b) thyroxine
(c) ductless
(d) deep