Lemur of mouse lemurs, the gray mouse lemur ("M. murinus"), golden-brown mouse lemur ("M. ravelobensis"), and Goodman's mouse lemur ("M. lehilahytsara") were considered the same species until recently, when genetic tests identified them as cryptic species. The lemur dentition is heterodont (having multiple tooth morphologies) and derives from an ancestral primate permanent dentition of . Indriids, sportive lemurs, the aye-aye, and the extinct sloth lemurs, monkey lemurs, and koala lemurs have reduced dentitions, having lost incisors, canines, or premolars. The ancestral deciduous dentition is , but young indriids, aye-ayes, koala lemurs, sloth lemurs, and probably monkey lemurs have fewer deciduous teeth.
What Is Life 16. It has since appeared on Newton-John compilation albums such as "" (1992) and "The Definitive Collection" (2002). In 1971, British easy listening pianist Ronnie Aldrich covered "What Is Life" (as well as "My Sweet Lord") on his album "Love Story". That same year, a version by the Ventures appeared on their "New Testament" album. Also in 1971, a Finnish-language version of the song, titled "Mikä Saa Ihmisen Elämään", was released as a single by local singer Oliver – better known as Veikko Laiho, of the Laiho Trio. In 1992, Nicola Sirkis covered the song on the album "Dans La