There are actually 3 species: the Platypus, the Long-nosed Echidna, and the Short-nosed Echidna.The order Montremata is divided into two families: Ornithorhynchidae (having only one species of...
Through evolution. There are two main kinds of evolution which are gradualism and punctuated equilibrium. In gradualism, natural selection slowly removes unfavorable traits for the environment that...