No, it's not obvious. That's why they needed to be told.
There's no commandment to believe that the sky is blue, because that is obvious. There is a commandment saying not to interplant different kinds of crops, which presumably was necessary because the reason for that is not readily apparent.
Did God tell you anything about monkeys one way or the other?
What are having trouble with about some things are obvious and some things are not obvious?
I still have no idea what you're talking about.
NM, The Baker St. reference was because I thought you were from the UK. I remember now that you are not.
Edited by Chuck77, : No reason given.