Question

lo 7.3. what is the function of sperm?
to regulate the temperature of the developing embryo
to provide nutrition to the developing embryo
to help build the placenta
to swim towards the female egg during fertilization
to protect the developing fetus

Explanation:

Sperm's main role is in fertilization. It has a tail (flagellum) that enables it to swim towards the female egg. The other options: regulating embryo temperature is not sperm's function (related to maternal body mechanisms etc.), providing nutrition to embryo is mainly via placenta later (and sperm doesn't do this), building placenta is a complex process involving maternal and embryonic tissues (not sperm's direct job), protecting fetus is more about maternal structures (like uterus, amniotic fluid etc.).

Answer:

To swim towards the female egg during fertilization