Why are rats more evolved than platypus?

Platypus belongs to a group of egg laying mammals called monotremes. It has a very small range(eastern Australia) and they evolved from an earlier branch of the mammal tree. read more

Rats are placental mammals and highly adaptable. They have a wide range of distribution and are quite resilient. Since, evolutionarily, rats are more recent forms of life on earth, they have lot more sophisticated gene makeup and physiological features which gives them an upper hand over Platypus. read more

Platypus lies in sub groups Aves and Mammalia. Rats belong to the sub group of Mammalia and Mammalia has undergone several evolutionary changes since time immemorial. In fact, rats have evolved more than human itself. read more