Is BSD in the kernel or a sever process in user space?

"Jarod" <[email protected]>
Newsgroups gmane.os.opendarwin.general
Message-ID <001801c4d4bd$7a221d20$0200a8c0@siea>
 I am new to darwin. I am curious about whether BSD is put in the mach kerenl or just a user level process runing above mach kernel.

Thanks
Jarod
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