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.
The external genitalia of marsupials and placentals are superficially similar, but there are differences in development. Sexual differentiation occurs during gestation in the foetus of placentals, at which point the external appearance of both sexes is the same, hence the term 'the indifferent stage'.