Which organ System - Which is made up of glands which release
hormones into the bloodstream – works with the nervous systems to
regulate body temperature and blood pH levels and blood sugar
levels?

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.

The  correct answer should be a waste