Despite a lot of scientific evidence and many theories why does the origin of the universe remain a question to scientists?

Though there is a lot of scientific evidence and theories to explain the origin of the universe, yet its origin remains a question to the scientist. This is because, at the origin, the universe had infinite temperature and density. These conditions cannot be reproduced in lab and tested. Also, the observable universe is smaller than the actual. So, scientists have not been able to view the whole universe. Scientists have still not completely understood about dark matter and energy which is considered to form majority of the universe. Since there are many unanswered questions, the origin of the universe also remains a question.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d