Fossil evidence indicates that this order's ancestors maintained tribosphenic molars and cynodonts in their mouths, but no known discovery explains their ability to maintain constant body temperature in a variety of environments. This order's most unorthodox aspect is their birthing process. For 10 points, name this order of mammals that lays eggs, which includes the duck-billed platypus and the echidna.
Fossil evidence indicates that this order's ancestors maintained tribosphenic molars and cynodonts in their mouths, but no known discovery explains their ability to maintain constant body temperature in a variety of environments. This order's most unorthodox aspect is their birthing process. For 10 points, name this order of mammals that lays eggs, which includes the duck-billed platypus and the echidna.
Fossil evidence indicates that this order's ancestors maintained tribosphenic molars and cynodonts in their mouths, but no known discovery explains their ability to maintain constant body temperature in a variety of environments.