BusinessDictionary.com. Person or firm that endorses a three party agreement to guarantee that promises made by the first party (the principal) to the second party (client or lender) will be fulfilled, and assumes liability if the principal fails to fulfill them (defaults).
One in 2,000 babies are born with ambiguous genitalia and no one knows for sure if they are boys or girls.
Until the ninth week of embryo development, the embryonic reproductive apparatus is the same one for the two sexes. By the end of 20th week, the external genitalia changes for boys and girls are almost done.