Answered

which structure is correctly paired with its function?
1) ovary - provided milk for newborns
2) testis - development of sperm
3) placenta- storage of released eggs
4) uterus- produces estrogen

Answer :

meerkat18
The question is asking to choose among the following choices that states the correct paired of organ structure, and base on the choices, I would say that the answer would be #2. testis - development of sperm. I hope you are satisfied with my answer and feel free to ask for more 
Erudite1
The correct option is this: TESTIS FOR DEVELOPMENT OF SPERM.
The other options are wrong because:
1.It is the mammary gland that produce milk for newborns and not the ovary.
2. Placenta is not for storage of released eggs rather it functions in pregnancy to provide nourishment and gas exchange for the developing fetus and to facilitates the removal of its waste products.
3. Uterus do not serve to produce estrogen rather it nurtures the fertilized eggs that develop into fetus and accommodates it until it is ripe for birthing.