. 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 __________.
Ans. (a) fertilized egg.
(b) blood stream, target site.
(c) Testosterone, estrogen, secondary sexual.
(d) pituitary gland.