Yes, but they're recalcitrant.
Rudimentry - human males have nipples, for instance.
Yes
Both of them are exocrine glands i.e. they have duct systems that accept the glands' secretions; milk and sweat.
glandular epithelium
Mammary glands are compound tubulo-acinar glands, which means that they have branched tubes that end in alveoli. They are modified sweat glands.