(a) Oestrogen; progesterone; testosterone; prolactin.

(b) Ovary; fallopian tube; ureter; uterus.

(c) Seminiferous tubule; ovum; epididymis; sperm duct; urethra.

(d) Sperm; implantation; fertilisation; ovum; after birth.

Solution:-

(a) Testosterone

(b) Ureter

(c) Ovum

(d) After birth