you would need to address that question to the creator. but ovaries are internal organs because they are very fragile and form eggs monthly that are seeking fertilization. fertilization of course also takes place internally as well. you can't really have babies growing on the outside of the tummy can we? testicles are on the outside because spermatogenesis requires a cooler environment. if the testicles were on the inside sperm would not be viable. that is a very simplistic answer so i hope that addresses your question. sounds like a take-home school question to me.
why are the ovaries located inside the body and the testicles located outside the body?