Reaching the Age of Adolescence

Complete the following sentences.
(a) In females, the uterine wall thickens to receive the __________.
(b) Endocrine glands release hormones directly into___________for
transportation to the __________.
(c) The sex hormones,_______________________ and estrogen are
responsible for the development of __________ characters.
(d) Release of sex hormones is under the control of a hormone
secreted from the __________.